Minor Cleanup of RTCAudioSource.

webrtc/sdk/objc/Framework/Headers/WebRTC/RTCAudioSource.h

 /*
  *  Copyright 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #import <Foundation/Foundation.h>
 
 #import <WebRTC/RTCMacros.h>
 #import <WebRTC/RTCMediaSource.h>
 
 NS_ASSUME_NONNULL_BEGIN
 
 RTC_EXPORT
 @interface RTCAudioSource : RTCMediaSource
 
 - (instancetype)init NS_UNAVAILABLE;
 
-// Sets the volume for the RTCMediaSource. |volume] is a gain value in the range
+// Sets the volume for the RTCMediaSource. |volume| is a gain value in the range
 // [0, 10].
-// Temporary fix to be able to modify volume of remote audio tracks
-// TODO: property stays here temporarily until a proper volume-api is avaialble
-// on the surface exposed by webrtc
+// Temporary fix to be able to modify volume of remote audio tracks.
+// TODO(kthelgason): Property stays here temporarily until a proper volume-api
+// is available on the surface exposed by webrtc.
 @property(nonatomic, assign) double volume;
 
 @end
 
 NS_ASSUME_NONNULL_END