Add limitation

Author: pedrosousa

src/content/docs/waf/rate-limiting-rules/parameters.mdx

@@ -255,3 +255,5 @@ To use claims inside a JSON Web Token (JWT), you must first set up a [token vali
 - If the rule expression includes [custom lists](/waf/tools/lists/custom-lists/), you must enable the **Also apply rate limiting to cached assets** parameter.
 
 - The rule counting expression, defined in the **Increment counter when** parameter, cannot include both [HTTP response fields](/ruleset-engine/rules-language/fields/reference/?field-category=Response) and [custom lists](/waf/tools/lists/custom-lists/). If you use custom lists, you must enable the **Also apply rate limiting to cached assets** parameter.
+
+- When creating a rate limiting rule [at the account level](/waf/account/rate-limiting-rulesets/) as part of a rate limiting ruleset, the rule expression cannot contain [HTTP response fields](/ruleset-engine/rules-language/fields/reference/?field-category=Response) or [custom lists](/waf/tools/lists/custom-lists/).