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

Bug: webrtc:12338
Change-Id: Ib97b2c3d64dbd895f261ffa76a2e885bd934a87f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226940
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34554}
diff --git a/api/test/audio_quality_analyzer_interface.h b/api/test/audio_quality_analyzer_interface.h
index c104479..2eb7817 100644
--- a/api/test/audio_quality_analyzer_interface.h
+++ b/api/test/audio_quality_analyzer_interface.h
@@ -25,9 +25,9 @@
   ~AudioQualityAnalyzerInterface() override = default;
 
   // Will be called by the framework before the test.
-  // |test_case_name| is name of test case, that should be used to report all
+  // `test_case_name` is name of test case, that should be used to report all
   // audio metrics.
-  // |analyzer_helper| is a pointer to a class that will allow track_id to
+  // `analyzer_helper` is a pointer to a class that will allow track_id to
   // stream_id matching. The caller is responsible for ensuring the
   // AnalyzerHelper outlives the instance of the AudioQualityAnalyzerInterface.
   virtual void Start(std::string test_case_name,