changed format of cli note

Signed-off-by: Nathan Hsieh <hsieh.nathan@gmail.com>

docs/sources/reference/commandline/cli.md

@@ -1868,7 +1868,8 @@ See [*Find Public Images on Docker Hub*](
 /userguide/dockerrepos/#searching-for-images) for
 more details on finding shared images from the command line.
 
-*Note* - Search queries will only return up to 25 results 
+> **Note:** 
+> Search queries will only return up to 25 results 
 
 ## start