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

Bug: webrtc:12338
Change-Id: I753a476d1574d8dd50f1b6d4bfc2beb7f6f1f913
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226947
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34562}

examples/androidapp/src/org/appspot/apprtc/UnhandledExceptionHandler.java

@@ -66,7 +66,7 @@ public class UnhandledExceptionHandler implements Thread.UncaughtExceptionHandle
     });
   }
 
-  // Returns the Message attached to the original Cause of |t|.
+  // Returns the Message attached to the original Cause of `t`.
   private static String getTopLevelCauseMessage(Throwable t) {
     Throwable topLevelCause = t;
     while (topLevelCause.getCause() != null) {
@@ -75,8 +75,8 @@ public class UnhandledExceptionHandler implements Thread.UncaughtExceptionHandle
     return topLevelCause.getMessage();
   }
 
-  // Returns a human-readable String of the stacktrace in |t|, recursively
-  // through all Causes that led to |t|.
+  // Returns a human-readable String of the stacktrace in `t`, recursively
+  // through all Causes that led to `t`.
   private static String getRecursiveStackTrace(Throwable t) {
     StringWriter writer = new StringWriter();
     t.printStackTrace(new PrintWriter(writer));