Update application-gateway-waf-configuration.md

updating wording based on discussion with engineering.

Author: Miskatonic-Electronic

articles/web-application-firewall/ag/application-gateway-waf-configuration.md

@@ -39,11 +39,7 @@ You can specify an exact request header, body, cookie, or query string attribute
 - **Contains**: This operator matches all request fields that contain the specified selector value.
 - **Equals any**: This operator matches all request fields. * will be the selector value.
 
-Request URI query strings are case sensitive. While the scheme and host are case-insensitive and normally provided in lowercase; all other components are compared in a case-sensitive manner. Therefore, exclusion rules for query strings should be written in a case sensitive format.
-
-Request header names are case insensitive. However, request header values are case sensitive. 
-
-In all other cases matching is case insensitive. Regular expressions aren't allowed as selectors.
+In all cases, request header keys are case insensitive. Depending on your application, the names, and values, of your headers, cookies and query args can be case sensitive or insensitive. Request cookie keys, and request query arg keys are case sensitive. Regular expressions aren't allowed as selectors.
 
 > [!NOTE]
 > For more information and troubleshooting help, see [WAF troubleshooting](web-application-firewall-troubleshoot.md).