[CF1] RBI limit add (#25460)

Author: deadlypants1973

src/content/docs/cloudflare-one/policies/browser-isolation/known-limitations.mdx

@@ -17,6 +17,7 @@ Our Network Vector Rendering (NVR) technology allows us to deliver a secure remo
 - Webcam and microphone support is unavailable.
 - Websites that use WebGL may not function. To turn off WebGL in the browser, refer to [WebGL Rendering Error](/cloudflare-one/faq/troubleshooting/#i-see-webgl-rendering-error).
 - Netflix and Spotify Web Player are unavailable.
+- H.265/HEVC is not a supported video format at this time.
 
 ## Browser compatibility