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/peer_connection_interface.h b/api/peer_connection_interface.h
index b9350ac..a3c420f 100644
--- a/api/peer_connection_interface.h
+++ b/api/peer_connection_interface.h
@@ -1295,8 +1295,8 @@
   // This is called when signaling indicates a transceiver will be receiving
   // media from the remote endpoint. This is fired during a call to
   // SetRemoteDescription. The receiving track can be accessed by:
-  // |transceiver->receiver()->track()| and its associated streams by
-  // |transceiver->receiver()->streams()|.
+  // `transceiver->receiver()->track()` and its associated streams by
+  // `transceiver->receiver()->streams()`.
   // Note: This will only be called if Unified Plan semantics are specified.
   // This behavior is specified in section 2.2.8.2.5 of the "Set the
   // RTCSessionDescription" algorithm: