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

Bug: webrtc:12338
Change-Id: I753a476d1574d8dd50f1b6d4bfc2beb7f6f1f913
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226947
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34562}

examples/objc/AppRTCMobile/ARDAppClient.h

@@ -63,7 +63,7 @@ typedef NS_ENUM(NSInteger, ARDAppClientState) {
 // class should only be called from the main queue.
 @interface ARDAppClient : NSObject
 
-// If |shouldGetStats| is true, stats will be reported in 1s intervals through
+// If `shouldGetStats` is true, stats will be reported in 1s intervals through
 // the delegate.
 @property(nonatomic, assign) BOOL shouldGetStats;
 @property(nonatomic, readonly) ARDAppClientState state;
@@ -75,8 +75,8 @@ typedef NS_ENUM(NSInteger, ARDAppClientState) {
 - (instancetype)initWithDelegate:(id<ARDAppClientDelegate>)delegate;
 
 // Establishes a connection with the AppRTC servers for the given room id.
-// |settings| is an object containing settings such as video codec for the call.
-// If |isLoopback| is true, the call will connect to itself.
+// `settings` is an object containing settings such as video codec for the call.
+// If `isLoopback` is true, the call will connect to itself.
 - (void)connectToRoomWithId:(NSString *)roomId
                    settings:(ARDSettingsModel *)settings
                  isLoopback:(BOOL)isLoopback;

examples/objc/AppRTCMobile/ARDAppClient.m

@@ -64,7 +64,7 @@ static int64_t const kARDAppClientRtcEventLogMaxSizeInBytes = 5e6;  // 5 MB.
 static int const kKbpsMultiplier = 1000;
 
 // We need a proxy to NSTimer because it causes a strong retain cycle. When
-// using the proxy, |invalidate| must be called before it properly deallocs.
+// using the proxy, `invalidate` must be called before it properly deallocs.
 @interface ARDTimerProxy : NSObject
 
 - (instancetype)initWithInterval:(NSTimeInterval)interval

examples/objc/AppRTCMobile/ios/ARDMainView.m

@@ -64,7 +64,7 @@ static CGFloat const kCallControlMargin = 8;
 
 - (BOOL)textFieldShouldReturn:(UITextField *)textField {
   // There is no other control that can take focus, so manually resign focus
-  // when return (Join) is pressed to trigger |textFieldDidEndEditing|.
+  // when return (Join) is pressed to trigger `textFieldDidEndEditing`.
   [textField resignFirstResponder];
   return YES;
 }