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/frame_buffer2.h b/modules/video_coding/frame_buffer2.h
index 721668a..9226cc3 100644
--- a/modules/video_coding/frame_buffer2.h
+++ b/modules/video_coding/frame_buffer2.h
@@ -61,7 +61,7 @@
   int64_t InsertFrame(std::unique_ptr<EncodedFrame> frame);
 
   // Get the next frame for decoding. Will return at latest after
-  // |max_wait_time_ms|.
+  // `max_wait_time_ms`.
   void NextFrame(
       int64_t max_wait_time_ms,
       bool keyframe_required,
@@ -116,7 +116,7 @@
 
   using FrameMap = std::map<int64_t, FrameInfo>;
 
-  // Check that the references of |frame| are valid.
+  // Check that the references of `frame` are valid.
   bool ValidReferences(const EncodedFrame& frame) const;
 
   int64_t FindNextFrame(int64_t now_ms) RTC_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
@@ -134,9 +134,9 @@
   void PropagateDecodability(const FrameInfo& info)
       RTC_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
 
-  // Update the corresponding FrameInfo of |frame| and all FrameInfos that
-  // |frame| references.
-  // Return false if |frame| will never be decodable, true otherwise.
+  // Update the corresponding FrameInfo of `frame` and all FrameInfos that
+  // `frame` references.
+  // Return false if `frame` will never be decodable, true otherwise.
   bool UpdateFrameInfoWithIncomingFrame(const EncodedFrame& frame,
                                         FrameMap::iterator info)
       RTC_EXCLUSIVE_LOCKS_REQUIRED(mutex_);