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

Bug: webrtc:12338
Change-Id: I02613d9fca45d00e2477f334b7a0416e7912e26b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227037
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34621}
diff --git a/modules/audio_coding/neteq/tools/audio_loop.h b/modules/audio_coding/neteq/tools/audio_loop.h
index cd764cc..25da463 100644
--- a/modules/audio_coding/neteq/tools/audio_loop.h
+++ b/modules/audio_coding/neteq/tools/audio_loop.h
@@ -29,17 +29,17 @@
 
   virtual ~AudioLoop() {}
 
-  // Initializes the AudioLoop by reading from |file_name|. The loop will be no
-  // longer than |max_loop_length_samples|, if the length of the file is
+  // Initializes the AudioLoop by reading from `file_name`. The loop will be no
+  // longer than `max_loop_length_samples`, if the length of the file is
   // greater. Otherwise, the loop length is the same as the file length.
-  // The audio will be delivered in blocks of |block_length_samples|.
+  // The audio will be delivered in blocks of `block_length_samples`.
   // Returns false if the initialization failed, otherwise true.
   bool Init(const std::string file_name,
             size_t max_loop_length_samples,
             size_t block_length_samples);
 
   // Returns a (pointer,size) pair for the next block of audio. The size is
-  // equal to the |block_length_samples| Init() argument.
+  // equal to the `block_length_samples` Init() argument.
   rtc::ArrayView<const int16_t> GetNextBlock();
 
  private: