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

Bug: webrtc:12338
Change-Id: I300ba78fc4423db7030e555d7e51d2cb2246e9a4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227162
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34678}
diff --git a/modules/desktop_capture/screen_capturer_helper.h b/modules/desktop_capture/screen_capturer_helper.h
index 3e65860..f7c447a 100644
--- a/modules/desktop_capture/screen_capturer_helper.h
+++ b/modules/desktop_capture/screen_capturer_helper.h
@@ -39,7 +39,7 @@
   // Invalidate the entire screen, of a given size.
   void InvalidateScreen(const DesktopSize& size);
 
-  // Copies current invalid region to |invalid_region| clears invalid region
+  // Copies current invalid region to `invalid_region` clears invalid region
   // storage for the next frame.
   void TakeInvalidRegion(DesktopRegion* invalid_region);
 
@@ -52,16 +52,16 @@
   // be changed in the compressed output. So we need to re-render an entire
   // block whenever part of the block changes.
   //
-  // If |log_grid_size| is >= 1, then this function makes TakeInvalidRegion()
+  // If `log_grid_size` is >= 1, then this function makes TakeInvalidRegion()
   // produce an invalid region expanded so that its vertices lie on a grid of
-  // size 2 ^ |log_grid_size|. The expanded region is then clipped to the size
+  // size 2 ^ `log_grid_size`. The expanded region is then clipped to the size
   // of the most recently captured screen, as previously set by
   // set_size_most_recent().
-  // If |log_grid_size| is <= 0, then the invalid region is not expanded.
+  // If `log_grid_size` is <= 0, then the invalid region is not expanded.
   void SetLogGridSize(int log_grid_size);
 
   // Expands a region so that its vertices all lie on a grid.
-  // The grid size must be >= 2, so |log_grid_size| must be >= 1.
+  // The grid size must be >= 2, so `log_grid_size` must be >= 1.
   static void ExpandToGrid(const DesktopRegion& region,
                            int log_grid_size,
                            DesktopRegion* result);
@@ -72,7 +72,7 @@
   // capture.
   DesktopRegion invalid_region_ RTC_GUARDED_BY(invalid_region_mutex_);
 
-  // A lock protecting |invalid_region_| across threads.
+  // A lock protecting `invalid_region_` across threads.
   Mutex invalid_region_mutex_;
 
   // The size of the most recently captured screen.