fix link

Author: JamesG-Speechmatics

docs/speech-to-text/features/audio-filtering.mdx

@@ -45,7 +45,7 @@ This will avoid processing any audio which is below the `3.4` volume threshold.
 
 `volume_threshold` supports a range of `0 - 100` where `0` does not filter any audio and `100` removes all audio.
 
-In realtime mode, the threshold can be adjusted dynamically with the `SetRecognitionConfig` message.
+In realtime mode, the threshold can be adjusted dynamically with the  [SetRecognitionConfig](/api-ref/realtime-transcription-websocket#setrecognitionconfig) message.
 
 ## Volume labelling