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

Bug: webrtc:12338
Change-Id: I02613d9fca45d00e2477f334b7a0416e7912e26b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227037
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34621}

modules/audio_coding/neteq/sync_buffer.h

@@ -35,55 +35,55 @@ class SyncBuffer : public AudioMultiVector {
   // Returns the number of samples yet to play out from the buffer.
   size_t FutureLength() const;
 
-  // Adds the contents of |append_this| to the back of the SyncBuffer. Removes
+  // Adds the contents of `append_this` to the back of the SyncBuffer. Removes
   // the same number of samples from the beginning of the SyncBuffer, to
-  // maintain a constant buffer size. The |next_index_| is updated to reflect
+  // maintain a constant buffer size. The `next_index_` is updated to reflect
   // the move of the beginning of "future" data.
   void PushBack(const AudioMultiVector& append_this) override;
 
   // Like PushBack, but reads the samples channel-interleaved from the input.
   void PushBackInterleaved(const rtc::BufferT<int16_t>& append_this);
 
-  // Adds |length| zeros to the beginning of each channel. Removes
+  // Adds `length` zeros to the beginning of each channel. Removes
   // the same number of samples from the end of the SyncBuffer, to
-  // maintain a constant buffer size. The |next_index_| is updated to reflect
+  // maintain a constant buffer size. The `next_index_` is updated to reflect
   // the move of the beginning of "future" data.
   // Note that this operation may delete future samples that are waiting to
   // be played.
   void PushFrontZeros(size_t length);
 
-  // Inserts |length| zeros into each channel at index |position|. The size of
-  // the SyncBuffer is kept constant, which means that the last |length|
+  // Inserts `length` zeros into each channel at index `position`. The size of
+  // the SyncBuffer is kept constant, which means that the last `length`
   // elements in each channel will be purged.
   virtual void InsertZerosAtIndex(size_t length, size_t position);
 
   // Overwrites each channel in this SyncBuffer with values taken from
-  // |insert_this|. The values are taken from the beginning of |insert_this| and
-  // are inserted starting at |position|. |length| values are written into each
-  // channel. The size of the SyncBuffer is kept constant. That is, if |length|
-  // and |position| are selected such that the new data would extend beyond the
+  // `insert_this`. The values are taken from the beginning of `insert_this` and
+  // are inserted starting at `position`. `length` values are written into each
+  // channel. The size of the SyncBuffer is kept constant. That is, if `length`
+  // and `position` are selected such that the new data would extend beyond the
   // end of the current SyncBuffer, the buffer is not extended.
-  // The |next_index_| is not updated.
+  // The `next_index_` is not updated.
   virtual void ReplaceAtIndex(const AudioMultiVector& insert_this,
                               size_t length,
                               size_t position);
 
-  // Same as the above method, but where all of |insert_this| is written (with
+  // Same as the above method, but where all of `insert_this` is written (with
   // the same constraints as above, that the SyncBuffer is not extended).
   virtual void ReplaceAtIndex(const AudioMultiVector& insert_this,
                               size_t position);
 
-  // Reads |requested_len| samples from each channel and writes them interleaved
-  // into |output|. The |next_index_| is updated to point to the sample to read
-  // next time. The AudioFrame |output| is first reset, and the |data_|,
-  // |num_channels_|, and |samples_per_channel_| fields are updated.
+  // Reads `requested_len` samples from each channel and writes them interleaved
+  // into `output`. The `next_index_` is updated to point to the sample to read
+  // next time. The AudioFrame `output` is first reset, and the `data_`,
+  // `num_channels_`, and `samples_per_channel_` fields are updated.
   void GetNextAudioInterleaved(size_t requested_len, AudioFrame* output);
 
-  // Adds |increment| to |end_timestamp_|.
+  // Adds `increment` to `end_timestamp_`.
   void IncreaseEndTimestamp(uint32_t increment);
 
   // Flushes the buffer. The buffer will contain only zeros after the flush, and
-  // |next_index_| will point to the end, like when the buffer was first
+  // `next_index_` will point to the end, like when the buffer was first
   // created.
   void Flush();