Use backticks not vertical bars to denote variables in comments

Bug: webrtc:12338
Change-Id: I89c8b3a328d04203177522cbdfd9e606fd4bce4c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/228246
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34696}
diff --git a/sdk/android/api/org/webrtc/DataChannel.java b/sdk/android/api/org/webrtc/DataChannel.java
index 804915d..b9301f1 100644
--- a/sdk/android/api/org/webrtc/DataChannel.java
+++ b/sdk/android/api/org/webrtc/DataChannel.java
@@ -82,7 +82,7 @@
     /** The data channel state has changed. */
     @CalledByNative("Observer") public void onStateChange();
     /**
-     * A data buffer was successfully received.  NOTE: |buffer.data| will be
+     * A data buffer was successfully received.  NOTE: `buffer.data` will be
      * freed once this function returns so callers who want to use the data
      * asynchronously must make sure to copy it first.
      */
diff --git a/sdk/objc/api/peerconnection/RTCDataChannel.h b/sdk/objc/api/peerconnection/RTCDataChannel.h
index 6f4ef37..89eb58b 100644
--- a/sdk/objc/api/peerconnection/RTCDataChannel.h
+++ b/sdk/objc/api/peerconnection/RTCDataChannel.h
@@ -112,7 +112,7 @@
 
 /**
  * The number of bytes of application data that have been queued using
- * |sendData:| but that have not yet been transmitted to the network.
+ * `sendData:` but that have not yet been transmitted to the network.
  */
 @property(nonatomic, readonly) uint64_t bufferedAmount;
 
diff --git a/sdk/objc/components/audio/RTCAudioSession.h b/sdk/objc/components/audio/RTCAudioSession.h
index 59250fe..5881155 100644
--- a/sdk/objc/components/audio/RTCAudioSession.h
+++ b/sdk/objc/components/audio/RTCAudioSession.h
@@ -122,7 +122,7 @@
  *  WebRTC and the application layer are avoided.
  *
  *  RTCAudioSession also coordinates activation so that the audio session is
- *  activated only once. See |setActive:error:|.
+ *  activated only once. See `setActive:error:`.
  */
 RTC_OBJC_EXPORT
 @interface RTC_OBJC_TYPE (RTCAudioSession) : NSObject <RTC_OBJC_TYPE(RTCAudioSessionActivationDelegate)>