avcodec/avcodec: Document the data type for AV_PKT_DATA_MPEGTS_STREAM_ID

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/avcodec.h

@@ -1328,7 +1328,7 @@ enum AVPacketSideDataType {
     AV_PKT_DATA_METADATA_UPDATE,
 
     /**
-     * MPEGTS stream ID, this is required to pass the stream ID
+     * MPEGTS stream ID as uint8_t, this is required to pass the stream ID
      * information from the demuxer to the corresponding muxer.
      */
     AV_PKT_DATA_MPEGTS_STREAM_ID,