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

Bug: webrtc:12338
Change-Id: Ifaad29ccb63b0f2f3aeefb77dae061ebc7f87e6c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227024
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34561}
diff --git a/sdk/android/native_api/jni/class_loader.cc b/sdk/android/native_api/jni/class_loader.cc
index d0aa395..1789d78 100644
--- a/sdk/android/native_api/jni/class_loader.cc
+++ b/sdk/android/native_api/jni/class_loader.cc
@@ -18,7 +18,7 @@
 #include "sdk/android/native_api/jni/java_types.h"
 #include "sdk/android/native_api/jni/scoped_java_ref.h"
 
-// Abort the process if |jni| has a Java exception pending. This macros uses the
+// Abort the process if `jni` has a Java exception pending. This macros uses the
 // comma operator to execute ExceptionDescribe and ExceptionClear ignoring their
 // return values and sending "" to the error stream.
 #define CHECK_EXCEPTION(jni)        \