Use backticks not vertical bars to denote variables in comments

Bug: webrtc:12338
Change-Id: I89c8b3a328d04203177522cbdfd9e606fd4bce4c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/228246
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34696}
diff --git a/modules/audio_processing/gain_controller2_unittest.cc b/modules/audio_processing/gain_controller2_unittest.cc
index b1ab00e..8f65a89 100644
--- a/modules/audio_processing/gain_controller2_unittest.cc
+++ b/modules/audio_processing/gain_controller2_unittest.cc
@@ -310,7 +310,7 @@
     GainController2,
     FixedDigitalTest,
     ::testing::Values(
-        // When gain < |test::kLimiterMaxInputLevelDbFs|, the limiter will not
+        // When gain < `test::kLimiterMaxInputLevelDbFs`, the limiter will not
         // saturate the signal (at any sample rate).
         FixedDigitalTestParams(0.1f,
                                test::kLimiterMaxInputLevelDbFs - 0.01f,
@@ -320,7 +320,7 @@
                                test::kLimiterMaxInputLevelDbFs - 0.01f,
                                48000,
                                false),
-        // When gain > |test::kLimiterMaxInputLevelDbFs|, the limiter will
+        // When gain > `test::kLimiterMaxInputLevelDbFs`, the limiter will
         // saturate the signal (at any sample rate).
         FixedDigitalTestParams(test::kLimiterMaxInputLevelDbFs + 0.01f,
                                10.f,