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/api/video_codecs/video_encoder.h b/api/video_codecs/video_encoder.h
index 2bdf8d0..3035dd7 100644
--- a/api/video_codecs/video_encoder.h
+++ b/api/video_codecs/video_encoder.h
@@ -287,7 +287,7 @@
     // the last InitEncode() call.
     double framerate_fps;
     // The network bandwidth available for video. This is at least
-    // |bitrate.get_sum_bps()|, but may be higher if the application is not
+    // `bitrate.get_sum_bps()`, but may be higher if the application is not
     // network constrained.
     DataRate bandwidth_allocation;
 
diff --git a/api/video_codecs/video_encoder_config.h b/api/video_codecs/video_encoder_config.h
index 5440f1f..cfda2ad 100644
--- a/api/video_codecs/video_encoder_config.h
+++ b/api/video_codecs/video_encoder_config.h
@@ -129,7 +129,7 @@
     // An implementation should return a std::vector<VideoStream> with the
     // wanted VideoStream settings for the given video resolution.
     // The size of the vector may not be larger than
-    // |encoder_config.number_of_streams|.
+    // `encoder_config.number_of_streams`.
     virtual std::vector<VideoStream> CreateEncoderStreams(
         int width,
         int height,
diff --git a/api/video_codecs/vp8_frame_buffer_controller.h b/api/video_codecs/vp8_frame_buffer_controller.h
index 852008f..fc494f7 100644
--- a/api/video_codecs/vp8_frame_buffer_controller.h
+++ b/api/video_codecs/vp8_frame_buffer_controller.h
@@ -129,7 +129,7 @@
   // Called by the encoder before encoding a frame. Returns a set of overrides
   // the controller wishes to enact in the encoder's configuration.
   // If a value is not overridden, previous overrides are still in effect.
-  // However, if |Vp8EncoderConfig::reset_previous_configuration_overrides|
+  // However, if `Vp8EncoderConfig::reset_previous_configuration_overrides`
   // is set to `true`, all previous overrides are reset.
   virtual Vp8EncoderConfig UpdateConfiguration(size_t stream_index) = 0;