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}

sdk/android/src/java/org/webrtc/AndroidVideoDecoder.java

@@ -514,7 +514,7 @@ class AndroidVideoDecoder implements VideoDecoder, VideoSink {
       throw new AssertionError("Stride is not divisible by two: " + stride);
     }
 
-    // Note that the case with odd |sliceHeight| is handled in a special way.
+    // Note that the case with odd `sliceHeight` is handled in a special way.
     // The chroma height contained in the payload is rounded down instead of
     // up, making it one row less than what we expect in WebRTC. Therefore, we
     // have to duplicate the last chroma rows for this case. Also, the offset