docs(VoiceReceiverAdapter): improve message

Write an improved, more specific JavaDoc for VoiceReceiverAdapter.

Signed-off-by: Chris Sdogkos <work@chris-sdogkos.com>

Author: christolis

application/src/main/java/org/togetherjava/tjbot/features/VoiceReceiverAdapter.java

@@ -9,7 +9,11 @@
 import java.util.regex.Pattern;
 
 /**
- * Default implementation of {@link VoiceReceiver}.
+ * Adapter implementation of a {@link VoiceReceiver}. A new receiver can then be registered by
+ * adding it to {@link Features}.
+ * <p>
+ * {@link #onVoiceUpdate(GuildVoiceUpdateEvent)} like the other provided methods can be overridden
+ * if desired. The default implementation is empty, the adapter will not react to such events.
  */
 public class VoiceReceiverAdapter implements VoiceReceiver {