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

Bug: webrtc:12338
Change-Id: I66ef388e0582fc7b0250d8f2605288f0d652b66a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227095
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34612}
diff --git a/modules/include/module.h b/modules/include/module.h
index 3b1e046..3046390 100644
--- a/modules/include/module.h
+++ b/modules/include/module.h
@@ -35,7 +35,7 @@
   virtual void Process() = 0;
 
   // This method is called when the module is attached to a *running* process
-  // thread or detached from one.  In the case of detaching, |process_thread|
+  // thread or detached from one.  In the case of detaching, `process_thread`
   // will be nullptr.
   //
   // This method will be called in the following cases:
diff --git a/modules/include/module_common_types.h b/modules/include/module_common_types.h
index 7c9ef39..8e4e546 100644
--- a/modules/include/module_common_types.h
+++ b/modules/include/module_common_types.h
@@ -30,7 +30,7 @@
 // Interface used by NackModule and JitterBuffer.
 class NackSender {
  public:
-  // If |buffering_allowed|, other feedback messages (e.g. key frame requests)
+  // If `buffering_allowed`, other feedback messages (e.g. key frame requests)
   // may be added to the same outgoing feedback message. In that case, it's up
   // to the user of the interface to ensure that when all buffer-able messages
   // have been added, the feedback message is triggered.
diff --git a/modules/include/module_fec_types.h b/modules/include/module_fec_types.h
index f9b35cc..fa35342 100644
--- a/modules/include/module_fec_types.h
+++ b/modules/include/module_fec_types.h
@@ -13,8 +13,8 @@
 
 namespace webrtc {
 
-// Types for the FEC packet masks. The type |kFecMaskRandom| is based on a
-// random loss model. The type |kFecMaskBursty| is based on a bursty/consecutive
+// Types for the FEC packet masks. The type `kFecMaskRandom` is based on a
+// random loss model. The type `kFecMaskBursty` is based on a bursty/consecutive
 // loss model. The packet masks are defined in
 // modules/rtp_rtcp/fec_private_tables_random(bursty).h
 enum FecMaskType {