added function documenttation

Author: vtn-dev-prithipal

android/src/main/java/io/wazo/callkeep/RNCallKeepModule.java

@@ -417,7 +417,11 @@ public void setMutedCall(String uuid, boolean shouldMute) {
         }
         conn.onCallAudioStateChanged(newAudioState);
     }
-
+    /**
+     * toggle audio route for speaker via connection service function
+     * @param uuid
+     * @param useSpeaker
+     */
     @ReactMethod
     public void toggleAudioRouteSpeaker(String uuid, boolean useSpeaker) {
         VoiceConnection conn = (VoiceConnection) VoiceConnectionService.getConnection(uuid);

index.js

@@ -164,7 +164,13 @@ class RNCallKeep {
   };
 
   sendDTMF = (uuid, key) => RNCallKeepModule.sendDTMF(uuid, key);
-
+  /**
+   * when Phone call is active, Android control the audio service via connection service. 
+   * so this function help to toggle the audio to Speaker or wired/ear-piece or vice-versa 
+   * @param {*} uuid 
+   * @param {*} useSpeaker 
+   * @returns toggle the Audio state to Speaker and vice-versa
+   */
   toggleAudioRouteSpeaker = (uuid, useSpeaker) => isIOS ? null : RNCallKeepModule.toggleAudioRouteSpeaker(uuid, useSpeaker);
 
   checkIfBusy = () =>