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

Bug: webrtc:12338
Change-Id: I52eb3b6675c4705e22f51b70799ed6139a3b46bc
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227164
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34686}
diff --git a/modules/rtp_rtcp/source/rtp_rtcp_impl2.h b/modules/rtp_rtcp/source/rtp_rtcp_impl2.h
index 2d8de02..14d1409 100644
--- a/modules/rtp_rtcp/source/rtp_rtcp_impl2.h
+++ b/modules/rtp_rtcp/source/rtp_rtcp_impl2.h
@@ -274,7 +274,7 @@
     // Handles final time timestamping/stats/etc and handover to Transport.
     RtpSenderEgress packet_sender;
     // If no paced sender configured, this class will be used to pass packets
-    // from |packet_generator_| to |packet_sender_|.
+    // from `packet_generator_` to `packet_sender_`.
     RtpSenderEgress::NonPacedPacketSender non_paced_sender;
     // Handles creation of RTP packets to be sent.
     RTPSender packet_generator;
@@ -295,7 +295,7 @@
   // Used from RtcpSenderMediator to maybe send rtcp.
   void MaybeSendRtcp() RTC_RUN_ON(worker_queue_);
 
-  // Called when |rtcp_sender_| informs of the next RTCP instant. The method may
+  // Called when `rtcp_sender_` informs of the next RTCP instant. The method may
   // be called on various sequences, and is called under a RTCPSenderLock.
   void ScheduleRtcpSendEvaluation(TimeDelta duration);
 
@@ -305,7 +305,7 @@
   void MaybeSendRtcpAtOrAfterTimestamp(Timestamp execution_time)
       RTC_RUN_ON(worker_queue_);
 
-  // Schedules a call to MaybeSendRtcpAtOrAfterTimestamp delayed by |duration|.
+  // Schedules a call to MaybeSendRtcpAtOrAfterTimestamp delayed by `duration`.
   void ScheduleMaybeSendRtcpAtOrAfterTimestamp(Timestamp execution_time,
                                                TimeDelta duration);