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/jitter_buffer_unittest.cc b/modules/video_coding/jitter_buffer_unittest.cc
index 752ceb8..801eeb6 100644
--- a/modules/video_coding/jitter_buffer_unittest.cc
+++ b/modules/video_coding/jitter_buffer_unittest.cc
@@ -1544,7 +1544,7 @@
   EXPECT_GE(InsertFrame(VideoFrameType::kVideoFrameKey), kNoError);
   EXPECT_TRUE(DecodeCompleteFrame());
 
-  // Drop one frame and insert |kNackHistoryLength| to trigger NACKing a too
+  // Drop one frame and insert `kNackHistoryLength` to trigger NACKing a too
   // old packet.
   DropFrame(1);
   // Insert a frame which should trigger a recycle until the next key frame.
@@ -1597,7 +1597,7 @@
   EXPECT_GE(InsertFrame(VideoFrameType::kVideoFrameKey), kNoError);
   EXPECT_TRUE(DecodeCompleteFrame());
 
-  // Generate and drop |kNackHistoryLength| packets to fill the NACK list.
+  // Generate and drop `kNackHistoryLength` packets to fill the NACK list.
   DropFrame(max_nack_list_size_ + 1);
   // Insert a frame which should trigger a recycle until the next key frame.
   EXPECT_EQ(kFlushIndicator, InsertFrame(VideoFrameType::kVideoFrameDelta));