Use backticks not vertical bars to denote variables in comments for /sdk

Bug: webrtc:12338
Change-Id: Ifaad29ccb63b0f2f3aeefb77dae061ebc7f87e6c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227024
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34561}
diff --git a/sdk/android/api/org/webrtc/DataChannel.java b/sdk/android/api/org/webrtc/DataChannel.java
index bcbf6f0..804915d 100644
--- a/sdk/android/api/org/webrtc/DataChannel.java
+++ b/sdk/android/api/org/webrtc/DataChannel.java
@@ -63,7 +63,7 @@
     public final ByteBuffer data;
 
     /**
-     * Indicates whether |data| contains UTF-8 text or "binary data"
+     * Indicates whether `data` contains UTF-8 text or "binary data"
      * (i.e. anything else).
      */
     public final boolean binary;
@@ -110,7 +110,7 @@
     this.nativeDataChannel = nativeDataChannel;
   }
 
-  /** Register |observer|, replacing any previously-registered observer. */
+  /** Register `observer`, replacing any previously-registered observer. */
   public void registerObserver(Observer observer) {
     checkDataChannelExists();
     if (nativeObserver != 0) {
@@ -157,7 +157,7 @@
     nativeClose();
   }
 
-  /** Send |data| to the remote peer; return success. */
+  /** Send `data` to the remote peer; return success. */
   public boolean send(Buffer buffer) {
     checkDataChannelExists();
     // TODO(fischman): this could be cleverer about avoiding copies if the