Fix a typo in javadoc.

 <p>

 The codec in turn will return a read-only output buffer via the {@link

 Callback#onOutputBufferAvailable onOutputBufferAvailable} callback in asynchronous mode, or in

 response to a {@link #dequeueOutputBuffer dequeuOutputBuffer} call in synchronous mode. After the

 response to a {@link #dequeueOutputBuffer dequeueOutputBuffer} call in synchronous mode. After the

 output buffer has been processed, call one of the {@link #releaseOutputBuffer

 releaseOutputBuffer} methods to return the buffer to the codec.

 <p>