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/win32.cc b/rtc_base/win32.cc
index 1a99c4f..8d8fe27 100644
--- a/rtc_base/win32.cc
+++ b/rtc_base/win32.cc
@@ -154,7 +154,7 @@
 }
 
 // Helper function for inet_pton for IPv4 addresses.
-// |src| points to a character string containing an IPv4 network address in
+// `src` points to a character string containing an IPv4 network address in
 // dotted-decimal format, "ddd.ddd.ddd.ddd", where ddd is a decimal number
 // of up to three digits in the range 0 to 255.
 // The address is converted and copied to dst,