Fix other formatting issues in MySQL Integration docs (#17647)

* fix other formatting issues with underscores

* fix key_reads entry

Author: caseycull

mysql/metadata.csv

@@ -1,5 +1,5 @@
 metric_name,metric_type,interval,unit_name,per_unit_name,description,orientation,integration,short_name,curated_metric
-mysql.binlog.cache_disk_use,gauge,,transaction,,The number of transactions that used the temporary binary log cache but that exceeded the value of binlog_cache_size and used a temporary file to store statements from the transaction.,0,mysql,mysql binlog cache_disk_use,
+mysql.binlog.cache_disk_use,gauge,,transaction,,The number of transactions that used the temporary binary log cache but that exceeded the value of `binlog_cache_size` and used a temporary file to store statements from the transaction.,0,mysql,mysql binlog cache_disk_use,
 mysql.binlog.cache_use,gauge,,transaction,,The number of transactions that used the binary log cache.,0,mysql,mysql binlog cache_use,
 mysql.binlog.disk_use,gauge,,byte,,Total binary log file size.,0,mysql,mysql binlog disk,
 mysql.galera.wsrep_cert_deps_distance,gauge,,,,"Shows the average distance between the lowest and highest sequence number, or seqno, values that the node can possibly apply in parallel.",0,mysql,mysql galera wsrep_cert_deps_distance,
@@ -127,7 +127,7 @@ mysql.myisam.key_buffer_bytes_unflushed,gauge,,byte,,MyISAM key buffer bytes unf
 mysql.myisam.key_buffer_bytes_used,gauge,,byte,,MyISAM key buffer bytes used.,0,mysql,mysql myisam key buffer bytes used,
 mysql.myisam.key_buffer_size,gauge,,byte,,Size of the buffer used for index blocks.,0,mysql,mysql myisam key_buffer_size,memory
 mysql.myisam.key_read_requests,gauge,,read,second,The number of requests to read a key block from the MyISAM key cache.,0,mysql,mysql myisam key_read_requests,
-mysql.myisam.key_reads,gauge,,read,second,"The number of physical reads of a key block from disk into the MyISAM key cache. If Key_reads is large, then your key_buffer_size value is probably too small. The cache miss rate can be calculated as Key_reads/Key_read_requests.",0,mysql,mysql myisam key_reads,
+mysql.myisam.key_reads,gauge,,read,second,"The number of physical reads of a key block from disk into the MyISAM key cache. If `key_reads` is large, then your key_buffer_size value is probably too small. The cache miss rate can be calculated as `key_reads`/`key_read_requests`.",0,mysql,mysql myisam key_reads,
 mysql.myisam.key_write_requests,gauge,,write,second,The number of requests to write a key block to the MyISAM key cache.,0,mysql,mysql myisam key_write_requests,
 mysql.myisam.key_writes,gauge,,write,second,The number of physical writes of a key block from the MyISAM key cache to disk.,0,mysql,mysql myisam key_writes,
 mysql.net.aborted_clients,gauge,,connection,second,The number of connections that were aborted because the client died without closing the connection properly.,0,mysql,mysql net aborted_clients,
@@ -169,15 +169,15 @@ mysql.performance.key_cache_utilization,gauge,,fraction,,The key cache utilizati
 mysql.performance.max_prepared_stmt_count,gauge,,,,The maximum allowed prepared statements on the server.,0,mysql,max prepared statements,
 mysql.performance.open_files,gauge,,file,,The number of open files.,0,mysql,open files,
 mysql.performance.open_tables,gauge,,table,,The number of of tables that are open.,0,mysql,open tables,
-mysql.performance.opened_tables,gauge,,table,second,"The number of tables that have been opened. If Opened_tables is big, your table_open_cache value is probably too small.",0,mysql,mysql performance opened_tables,
+mysql.performance.opened_tables,gauge,,table,second,"The number of tables that have been opened. If `opened_tables` is big, your `table_open_cache` value is probably too small.",0,mysql,mysql performance opened_tables,
 mysql.performance.prepared_stmt_count,gauge,,query,second,The current number of prepared statements.,0,mysql,current prepared statements,
 mysql.performance.qcache.utilization,gauge,,fraction,,Fraction of the query cache memory currently being used.,0,mysql,mysql performance qcache utilization,
 mysql.performance.qcache_free_blocks,gauge,,block,,The number of free memory blocks in the query cache.,0,mysql,mysql performance qcache_free_blocks,
 mysql.performance.qcache_free_memory,gauge,,byte,,The amount of free memory for the query cache.,0,mysql,mysql performance qcache_free_memory,
 mysql.performance.qcache_hits,gauge,,hit,second,The rate of query cache hits.,0,mysql,query cache hits,
 mysql.performance.qcache_inserts,gauge,,query,second,The number of queries added to the query cache.,0,mysql,mysql performance qcache_inserts,
 mysql.performance.qcache_lowmem_prunes,gauge,,query,second,The number of queries that were deleted from the query cache because of low memory.,0,mysql,mysql performance qcache_lowmem_prunes,
-mysql.performance.qcache_not_cached,gauge,,query,second,"The number of noncached queries (not cacheable, or not cached due to the query_cache_type setting).",0,mysql,mysql performance qcache_not_cached,
+mysql.performance.qcache_not_cached,gauge,,query,second,"The number of noncached queries (not cacheable, or not cached due to the `query_cache_type` setting).",0,mysql,mysql performance qcache_not_cached,
 mysql.performance.qcache_queries_in_cache,gauge,,query,,The number of queries registered in the query cache.,0,mysql,mysql performance qcache_queries_in_cache,
 mysql.performance.qcache_size,gauge,,byte,,The amount of memory allocated for caching query results.,0,mysql,mysql performance qcache_size,
 mysql.performance.qcache_total_blocks,gauge,,block,,The total number of blocks in the query cache.,0,mysql,mysql performance qcache_total_blocks,
@@ -190,7 +190,7 @@ mysql.performance.select_range,gauge,,operation,second,The number of joins that
 mysql.performance.select_range_check,gauge,,operation,second,"The number of joins without keys that check for key usage after each row. If this is not 0, you should carefully check the indexes of your tables.",0,mysql,mysql performance select_range_check,
 mysql.performance.select_scan,gauge,,operation,second,The number of joins that did a full scan of the first table.,0,mysql,mysql performance select_scan,
 mysql.performance.slow_queries,gauge,,query,second,The rate of slow queries (log queries that exceed a particular execution time).,-1,mysql,slow queries,
-mysql.performance.sort_merge_passes,gauge,,operation,second,"The number of merge passes that the sort algorithm has had to do. If this value is large, you should consider increasing the value of the sort_buffer_size system variable.",0,mysql,mysql performance sort_merge_passes,
+mysql.performance.sort_merge_passes,gauge,,operation,second,"The number of merge passes that the sort algorithm has had to do. If this value is large, you should consider increasing the value of the `sort_buffer_size` system variable.",0,mysql,mysql performance sort_merge_passes,
 mysql.performance.sort_range,gauge,,operation,second,The number of sorts that were done using ranges.,0,mysql,mysql performance sort_range,
 mysql.performance.sort_rows,gauge,,operation,second,The number of sorted rows.,0,mysql,mysql performance sort_rows,
 mysql.performance.sort_scan,gauge,,operation,second,The number of sorts that were done by scanning the table.,0,mysql,mysql performance sort_scan,
@@ -201,7 +201,7 @@ mysql.performance.table_locks_immediate.rate,gauge,,,,The rate of times that a r
 mysql.performance.table_locks_waited,gauge,,,,The total number of times that a request for a table lock could not be granted immediately and a wait was needed.,-1,mysql,table locks waited,
 mysql.performance.table_locks_waited.rate,gauge,,,,The rate of times that a request for a table lock could not be granted immediately and a wait was needed.,0,mysql,table locks waited rate,
 mysql.performance.table_open_cache,gauge,,,,The number of open tables for all threads. Increasing this value increases the number of file descriptors that mysqld requires.,0,mysql,mysql performance table_open_cache,
-mysql.performance.thread_cache_size,gauge,,byte,,"How many threads the server should cache for reuse. When a client disconnects, the client's threads are put in the cache if there are fewer than thread_cache_size threads there.",0,mysql,mysql performance thread_cache_size,memory
+mysql.performance.thread_cache_size,gauge,,byte,,"How many threads the server should cache for reuse. When a client disconnects, the client's threads are put in the cache if there are fewer than `thread_cache_size` threads there.",0,mysql,mysql performance thread_cache_size,memory
 mysql.performance.threads_cached,gauge,,thread,,The number of threads in the thread cache.,0,mysql,mysql performance threads_cached,
 mysql.performance.threads_connected,gauge,,connection,,The number of currently open connections.,0,mysql,threads connected,cpu
 mysql.performance.threads_created,count,,thread,,"The number of threads created to handle connections. If `threads_created` is big, you may want to increase the `thread_cache_size` value.",0,mysql,mysql performance threads_created,memory
@@ -232,4 +232,4 @@ mysql.replication.replicas_connected,gauge,,,,Number of replicas connected to a
 mysql.replication.seconds_behind_master,gauge,,second,,The lag in seconds between the master and the slave.,-1,mysql,replication lag,
 mysql.replication.seconds_behind_source,gauge,,second,,The lag in seconds between the source and the replica.,-1,mysql,replication lag,
 mysql.replication.slave_running,gauge,,,,Deprecated. Use service check mysql.replication.replica_running instead. A boolean showing if this server is a replication slave / master that is running.,0,mysql,slave running,
-mysql.replication.slaves_connected,gauge,,,,Deprecated. Use mysql.replication.replicas_connected instead. Number of slaves connected to a replication master.,0,mysql,slaves connected,
+mysql.replication.slaves_connected,gauge,,,,Deprecated. Use `mysql.replication.replicas_connected` instead. Number of slaves connected to a replication master.,0,mysql,slaves connected,