Merge pull request #214407 from ZarrVenkat/uppercase-transform

Update custom-waf-rules-overview.md

Author: prmerger-automator[bot]

articles/web-application-firewall/ag/custom-waf-rules-overview.md

@@ -145,6 +145,7 @@ Negates the current condition.
 A list of strings with names of transformations to do before the match is attempted. These can be the following transformations:
 
 - Lowercase
+- Uppercase
 - Trim
 - UrlDecode
 - UrlEncode