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/video/video_stream_encoder_interface.h b/api/video/video_stream_encoder_interface.h
index 34fa642..69d0ad2 100644
--- a/api/video/video_stream_encoder_interface.h
+++ b/api/video/video_stream_encoder_interface.h
@@ -68,9 +68,9 @@
   GetAdaptationResources() = 0;
 
   // Sets the source that will provide video frames to the VideoStreamEncoder's
-  // OnFrame method. |degradation_preference| control whether or not resolution
+  // OnFrame method. `degradation_preference` control whether or not resolution
   // or frame rate may be reduced. The VideoStreamEncoder registers itself with
-  // |source|, and signals adaptation decisions to the source in the form of
+  // `source`, and signals adaptation decisions to the source in the form of
   // VideoSinkWants.
   // TODO(nisse): When adaptation logic is extracted from this class,
   // it no longer needs to know the source.
@@ -78,8 +78,8 @@
       rtc::VideoSourceInterface<VideoFrame>* source,
       const DegradationPreference& degradation_preference) = 0;
 
-  // Sets the |sink| that gets the encoded frames. |rotation_applied| means
-  // that the source must support rotation. Only set |rotation_applied| if the
+  // Sets the `sink` that gets the encoded frames. `rotation_applied` means
+  // that the source must support rotation. Only set `rotation_applied` if the
   // remote side does not support the rotation extension.
   virtual void SetSink(EncoderSink* sink, bool rotation_applied) = 0;
 
@@ -102,13 +102,13 @@
   virtual void OnLossNotification(
       const VideoEncoder::LossNotification& loss_notification) = 0;
 
-  // Set the currently estimated network properties. A |target_bitrate|
+  // Set the currently estimated network properties. A `target_bitrate`
   // of zero pauses the encoder.
-  // |stable_target_bitrate| is a filtered version of |target_bitrate|. It  is
+  // `stable_target_bitrate` is a filtered version of `target_bitrate`. It  is
   // always less or equal to it. It can be used to avoid rapid changes of
   // expensive encoding settings, such as resolution.
-  // |link_allocation| is the bandwidth available for this video stream on the
-  // network link. It is always at least |target_bitrate| but may be higher
+  // `link_allocation` is the bandwidth available for this video stream on the
+  // network link. It is always at least `target_bitrate` but may be higher
   // if we are not network constrained.
   virtual void OnBitrateUpdated(DataRate target_bitrate,
                                 DataRate stable_target_bitrate,
@@ -122,8 +122,8 @@
   virtual void SetFecControllerOverride(
       FecControllerOverride* fec_controller_override) = 0;
 
-  // Creates and configures an encoder with the given |config|. The
-  // |max_data_payload_length| is used to support single NAL unit
+  // Creates and configures an encoder with the given `config`. The
+  // `max_data_payload_length` is used to support single NAL unit
   // packetization for H.264.
   virtual void ConfigureEncoder(VideoEncoderConfig config,
                                 size_t max_data_payload_length) = 0;