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}

api/jsep.h

diff --git a/api/jsep.h b/api/jsep.h
index b56cf1d..3348d7b 100644
--- a/api/jsep.h
+++ b/api/jsep.h
@@ -73,7 +73,7 @@
 
 // Creates a IceCandidateInterface based on SDP string.
 // Returns null if the sdp string can't be parsed.
-// |error| may be null.
+// `error` may be null.
 RTC_EXPORT IceCandidateInterface* CreateIceCandidate(const std::string& sdp_mid,
                                                      int sdp_mline_index,
                                                      const std::string& sdp,
@@ -91,7 +91,7 @@
  public:
   virtual ~IceCandidateCollection() {}
   virtual size_t count() const = 0;
-  // Returns true if an equivalent |candidate| exist in the collection.
+  // Returns true if an equivalent `candidate` exist in the collection.
   virtual bool HasCandidate(const IceCandidateInterface* candidate) const = 0;
   virtual const IceCandidateInterface* at(size_t index) const = 0;
 };
@@ -158,7 +158,7 @@
   virtual SdpType GetType() const;
 
   // kOffer/kPrAnswer/kAnswer
-  // TODO(steveanton): Remove this in favor of |GetType| that returns SdpType.
+  // TODO(steveanton): Remove this in favor of `GetType` that returns SdpType.
   virtual std::string type() const = 0;
 
   // Adds the specified candidate to the description.
@@ -190,7 +190,7 @@
 
 // Creates a SessionDescriptionInterface based on the SDP string and the type.
 // Returns null if the sdp string can't be parsed or the type is unsupported.
-// |error| may be null.
+// `error` may be null.
 // TODO(steveanton): This function is deprecated. Please use the functions below
 // which take an SdpType enum instead. Remove this once it is no longer used.
 RTC_EXPORT SessionDescriptionInterface* CreateSessionDescription(
@@ -200,8 +200,8 @@
 
 // Creates a SessionDescriptionInterface based on the SDP string and the type.
 // Returns null if the SDP string cannot be parsed.
-// If using the signature with |error_out|, details of the parsing error may be
-// written to |error_out| if it is not null.
+// If using the signature with `error_out`, details of the parsing error may be
+// written to `error_out` if it is not null.
 RTC_EXPORT std::unique_ptr<SessionDescriptionInterface>
 CreateSessionDescription(SdpType type, const std::string& sdp);
 RTC_EXPORT std::unique_ptr<SessionDescriptionInterface>
@@ -221,7 +221,7 @@
 class RTC_EXPORT CreateSessionDescriptionObserver
     : public rtc::RefCountInterface {
  public:
-  // This callback transfers the ownership of the |desc|.
+  // This callback transfers the ownership of the `desc`.
   // TODO(deadbeef): Make this take an std::unique_ptr<> to avoid confusion
   // around ownership.
   virtual void OnSuccess(SessionDescriptionInterface* desc) = 0;