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/generic_decoder.h b/modules/video_coding/generic_decoder.h
index 4beae60..aaab5fc 100644
--- a/modules/video_coding/generic_decoder.h
+++ b/modules/video_coding/generic_decoder.h
@@ -48,7 +48,7 @@
 
  private:
   SequenceChecker construction_thread_;
-  // Protect |_timestampMap|.
+  // Protect `_timestampMap`.
   Clock* const _clock;
   // This callback must be set before the decoder thread starts running
   // and must only be unset when external threads (e.g decoder thread)
@@ -63,12 +63,12 @@
   // Set by the field trial WebRTC-SlowDownDecoder to simulate a slow decoder.
   FieldTrialOptional<TimeDelta> _extra_decode_time;
 
-  // Set by the field trial WebRTC-LowLatencyRenderer. The parameter |enabled|
+  // Set by the field trial WebRTC-LowLatencyRenderer. The parameter `enabled`
   // determines if the low-latency renderer algorithm should be used for the
   // case min playout delay=0 and max playout delay>0.
   FieldTrialParameter<bool> low_latency_renderer_enabled_;
   // Set by the field trial WebRTC-LowLatencyRenderer. The parameter
-  // |include_predecode_buffer| determines if the predecode buffer should be
+  // `include_predecode_buffer` determines if the predecode buffer should be
   // taken into account when calculating maximum number of frames in composition
   // queue.
   FieldTrialParameter<bool> low_latency_renderer_include_predecode_buffer_;