fix docs

Author: Revolyssup

docs/en/latest/discovery/nacos.md

@@ -29,10 +29,41 @@ The performance of this module needs to be improved:
 
 ### Configuration for Nacos
 
+```yaml title="conf/config.yaml"
 Nacos can be configured in two ways: single instance or multi-instance.
+```
 
 Add following configuration in `conf/config.yaml` :
 
+### Single Instance method
+
+The below is a single nacos instance method that is also supported.
+
+```yaml
+discovery:
+  nacos:
+    host:
+      - "http://${username}:${password}@${host1}:${port1}"
+    prefix: "/nacos/v1/"
+    fetch_interval: 30    # default 30 sec
+    # `weight` is the `default_weight` that will be attached to each discovered node that
+    # doesn't have a weight explicitly provided in nacos results
+    weight: 100           # default 100
+    timeout:
+      connect: 2000       # default 2000 ms
+      send: 2000          # default 2000 ms
+      read: 5000          # default 5000 ms
+```
+
+And you can config it in short by default value:
+
+```yaml
+discovery:
+  nacos:
+    host:
+      - "http://192.168.33.1:8848"
+```
+
 #### Multi Instance method
 
 ```yaml
@@ -66,35 +97,6 @@ discovery:
         read: 5000                     # default 5000 ms
 ```
 
-### Single Instance method
-
-The below is a single nacos instance method that is also supported.
-
-```yaml
-discovery:
-  nacos:
-    host:
-      - "http://${username}:${password}@${host1}:${port1}"
-    prefix: "/nacos/v1/"
-    fetch_interval: 30    # default 30 sec
-    # `weight` is the `default_weight` that will be attached to each discovered node that
-    # doesn't have a weight explicitly provided in nacos results
-    weight: 100           # default 100
-    timeout:
-      connect: 2000       # default 2000 ms
-      send: 2000          # default 2000 ms
-      read: 5000          # default 5000 ms
-```
-
-And you can config it in short by default value:
-
-```yaml
-discovery:
-  nacos:
-    host:
-      - "http://192.168.33.1:8848"
-```
-
 ### Upstream setting
 
 #### L7