Update metricbeat/docs/modules/sql.asciidoc

Co-authored-by: subham sarkar <sarkar.subhams2@gmail.com>

Author: chrisberkhout

metricbeat/docs/modules/sql.asciidoc

@@ -886,7 +886,7 @@ In a URL any special characters should be URL encoded.
 
 In the key/value DSN format, if the password contains a backslash character (`\`), it must be escaped with another backslash. For example, if the password is `my\_password`, it must be written as `my\\_password`.
 
-The username and password to connect to the database can be provided as values to `username` and `password` keys of `sql.yml`.
+The username and password to connect to the database can be provided as values to the `username` and `password` keys of `sql.yml`.
 
 [source,yml]
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