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_coding/acm2/audio_coding_module.cc b/modules/audio_coding/acm2/audio_coding_module.cc
index d629139..8ba1b9f 100644
--- a/modules/audio_coding/acm2/audio_coding_module.cc
+++ b/modules/audio_coding/acm2/audio_coding_module.cc
@@ -229,7 +229,7 @@
     const InputData& input_data,
     absl::optional<int64_t> absolute_capture_timestamp_ms) {
   // TODO(bugs.webrtc.org/10739): add dcheck that
-  // |audio_frame.absolute_capture_timestamp_ms()| always has a value.
+  // `audio_frame.absolute_capture_timestamp_ms()` always has a value.
   AudioEncoder::EncodedInfo encoded_info;
   uint8_t previous_pltype;
 
@@ -333,7 +333,7 @@
   MutexLock lock(&acm_mutex_);
   int r = Add10MsDataInternal(audio_frame, &input_data_);
   // TODO(bugs.webrtc.org/10739): add dcheck that
-  // |audio_frame.absolute_capture_timestamp_ms()| always has a value.
+  // `audio_frame.absolute_capture_timestamp_ms()` always has a value.
   return r < 0
              ? r
              : Encode(input_data_, audio_frame.absolute_capture_timestamp_ms());