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/codec_timer.cc b/modules/video_coding/codec_timer.cc
index 0d4099b..b051957 100644
--- a/modules/video_coding/codec_timer.cc
+++ b/modules/video_coding/codec_timer.cc
@@ -18,7 +18,7 @@
 
 // The first kIgnoredSampleCount samples will be ignored.
 const int kIgnoredSampleCount = 5;
-// Return the |kPercentile| value in RequiredDecodeTimeMs().
+// Return the `kPercentile` value in RequiredDecodeTimeMs().
 const float kPercentile = 0.95f;
 // The window size in ms.
 const int64_t kTimeLimitMs = 10000;
@@ -30,7 +30,7 @@
 VCMCodecTimer::~VCMCodecTimer() = default;
 
 void VCMCodecTimer::AddTiming(int64_t decode_time_ms, int64_t now_ms) {
-  // Ignore the first |kIgnoredSampleCount| samples.
+  // Ignore the first `kIgnoredSampleCount` samples.
   if (ignored_sample_count_ < kIgnoredSampleCount) {
     ++ignored_sample_count_;
     return;