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

Bug: webrtc:12338
Change-Id: I72fcb505a92f03b2ace7160ee33d555a977eddfd
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226955
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34587}
diff --git a/rtc_base/platform_thread.h b/rtc_base/platform_thread.h
index 11ccfae..2c82c02 100644
--- a/rtc_base/platform_thread.h
+++ b/rtc_base/platform_thread.h
@@ -50,12 +50,12 @@
   // removed.
   PlatformThread() = default;
 
-  // Moves |rhs| into this, storing an empty state in |rhs|.
+  // Moves `rhs` into this, storing an empty state in `rhs`.
   // TODO(bugs.webrtc.org/12727) Look into if default and move support can be
   // removed.
   PlatformThread(PlatformThread&& rhs);
 
-  // Moves |rhs| into this, storing an empty state in |rhs|.
+  // Moves `rhs` into this, storing an empty state in `rhs`.
   // TODO(bugs.webrtc.org/12727) Look into if default and move support can be
   // removed.
   PlatformThread& operator=(PlatformThread&& rhs);