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

Bug: webrtc:12338
Change-Id: Ia8a9adea291d594e4f59a6a1203a7bfb0758adac
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227165
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34684}
diff --git a/modules/video_coding/video_codec_initializer.cc b/modules/video_coding/video_codec_initializer.cc
index 17ea66a..5d06a2c 100644
--- a/modules/video_coding/video_codec_initializer.cc
+++ b/modules/video_coding/video_codec_initializer.cc
@@ -76,8 +76,8 @@
       static_cast<unsigned char>(streams.size());
   video_codec.minBitrate = streams[0].min_bitrate_bps / 1000;
   bool codec_active = false;
-  // Active configuration might not be fully copied to |streams| for SVC yet.
-  // Therefore the |config| is checked here.
+  // Active configuration might not be fully copied to `streams` for SVC yet.
+  // Therefore the `config` is checked here.
   for (const VideoStream& stream : config.simulcast_layers) {
     if (stream.active) {
       codec_active = true;