[WAF] Update find-rate-limit.mdx (#25974)

Add "Request rate analysis" missing dropdown option in Security Analytics

Author: zeinjaber

src/content/docs/waf/rate-limiting-rules/find-rate-limit.mdx

@@ -28,6 +28,7 @@ The main chart displays the distribution of request rates for the top 50 unique
 - [**JA3 fingerprint**](/bots/additional-configurations/ja3-ja4-fingerprint/) (only available to customers with Bot Management)
 - **IP & JA3** (only available to customers with Bot Management)
 - [**JA4 fingerprint**](/bots/additional-configurations/ja3-ja4-fingerprint/) (only available to customers with Bot Management)
+- **IP & JA4** (only available to customers with Bot Management)
 
 :::note