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

Bug: webrtc:12338
Change-Id: Ib97b2c3d64dbd895f261ffa76a2e885bd934a87f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226940
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34554}
diff --git a/api/neteq/neteq_factory.h b/api/neteq/neteq_factory.h
index 65cf9eb..526a128 100644
--- a/api/neteq/neteq_factory.h
+++ b/api/neteq/neteq_factory.h
@@ -24,7 +24,7 @@
  public:
   virtual ~NetEqFactory() = default;
 
-  // Creates a new NetEq object, with parameters set in |config|. The |config|
+  // Creates a new NetEq object, with parameters set in `config`. The `config`
   // object will only have to be valid for the duration of the call to this
   // method.
   virtual std::unique_ptr<NetEq> CreateNetEq(