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/task_queue/queued_task.h b/api/task_queue/queued_task.h
index 5748628..27a5eda 100644
--- a/api/task_queue/queued_task.h
+++ b/api/task_queue/queued_task.h
@@ -20,9 +20,9 @@
   virtual ~QueuedTask() = default;
 
   // Main routine that will run when the task is executed on the desired queue.
-  // The task should return |true| to indicate that it should be deleted or
-  // |false| to indicate that the queue should consider ownership of the task
-  // having been transferred.  Returning |false| can be useful if a task has
+  // The task should return `true` to indicate that it should be deleted or
+  // `false` to indicate that the queue should consider ownership of the task
+  // having been transferred.  Returning `false` can be useful if a task has
   // re-posted itself to a different queue or is otherwise being re-used.
   virtual bool Run() = 0;
 };