update compatibility for websocket

Co-authored-by: Sergei Gunchenko <26045362+sxgunchenko@users.noreply.github.com>

docs/general/ad-filtering/create-own-filters.md

@@ -628,7 +628,7 @@ the type will be determined using the `Content-Type` header at the beginning of
 | [$script](#script-modifier) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
 | [$stylesheet](#stylesheet-modifier) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
 | [$subdocument](#subdocument-modifier) | ✅ * | ✅ | ✅ | ✅ | ✅ | ❌ |
-| [$websocket](#websocket-modifier) | ? | ✅ | ✅ | ✅ * | ✅ * | ✅ |
+| [$websocket](#websocket-modifier) | ✅ | ✅ | ✅ | ✅ * | ✅ * | ✅ |
 | [$xmlhttprequest](#xmlhttprequest-modifier) | ✅ | ✅ | ✅ | ✅ | ✅ | ? |
 | [$webrtc 🚫](#webrtc-modifier "removed") | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ |
 | [$object-subrequest 🚫](#object-subrequest-modifier "removed") | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ |