Update AudioRecord comments to match AudioTrack

                                     struct timespec *elapsed = NULL, size_t *nonContig = NULL);

public:

    /* Release an emptied buffer of "audioBuffer->frameCount" frames for AudioFlinger to re-fill. */

    // FIXME make private when obtainBuffer() for TRANSFER_OBTAIN is removed

    /* Public API for TRANSFER_OBTAIN mode.

     * Release an emptied buffer of "audioBuffer->frameCount" frames for AudioFlinger to re-fill.

     *

     * Buffer fields:

     *  frameCount  currently ignored but recommend to set to actual number of frames consumed

     *  size        actual number of bytes consumed, must be multiple of frameSize

     *  raw         ignored

     */

            void        releaseBuffer(const Buffer* audioBuffer);

    /* As a convenience we provide a read() interface to the audio buffer.