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

Bug: webrtc:12338
Change-Id: Ia8a9adea291d594e4f59a6a1203a7bfb0758adac
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227165
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34684}
diff --git a/modules/video_coding/video_coding_impl.h b/modules/video_coding/video_coding_impl.h
index d747994..9633fb7 100644
--- a/modules/video_coding/video_coding_impl.h
+++ b/modules/video_coding/video_coding_impl.h
@@ -120,7 +120,7 @@
   size_t max_nack_list_size_;
 
   // Callbacks are set before the decoder thread starts.
-  // Once the decoder thread has been started, usage of |_codecDataBase| moves
+  // Once the decoder thread has been started, usage of `_codecDataBase` moves
   // over to the decoder thread.
   VCMDecoderDataBase _codecDataBase;