add back highlighting the use of -h flag for size of item that was accidentally removed

Author: s-sajid-ali

docs/hpc/13_tutorial_intro_shell_hpc/06_scripts_variables_loops.mdx

@@ -105,7 +105,9 @@ That’s a huge amount of output: a full listing of everything in the directory.
     </TabItem>
     <TabItem value="column5" label="Size of item">
         This is the number of bytes in a file, or the number of filesystem blocks occupied by the contents of a folder.
+        :::tip
         We can use the `-h` option here to get a human-readable file size in megabytes, gigabytes, etc.
+        :::
     </TabItem>
     <TabItem value="column6" label="Time last modified">
         This is the last time the file was modified.