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;
 };
diff --git a/api/task_queue/task_queue_test.cc b/api/task_queue/task_queue_test.cc
index 0d411d2..3458edb 100644
--- a/api/task_queue/task_queue_test.cc
+++ b/api/task_queue/task_queue_test.cc
@@ -37,7 +37,7 @@
   rtc::Event event;
   auto queue = CreateTaskQueue(factory, "PostAndCheckCurrent");
 
-  // We're not running a task, so |queue| shouldn't be current.
+  // We're not running a task, so `queue` shouldn't be current.
   // Note that because rtc::Thread also supports the TQ interface and
   // TestMainImpl::Init wraps the main test thread (bugs.webrtc.org/9714), that
   // means that TaskQueueBase::Current() will still return a valid value.
@@ -190,7 +190,7 @@
 }
 
 TEST_P(TaskQueueTest, PostALot) {
-  // Waits until DecrementCount called |count| times. Thread safe.
+  // Waits until DecrementCount called `count` times. Thread safe.
   class BlockingCounter {
    public:
     explicit BlockingCounter(int initial_count) : count_(initial_count) {}