Avoid one more instance of angular brackets in Doxygen comments.

Originally committed as revision 23982 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/cook.c

@@ -365,7 +365,7 @@ static av_cold int cook_decode_close(AVCodecContext *avctx)
  * Fill the gain array for the timedomain quantization.
  *
  * @param q                 pointer to the COOKContext
- * @param gaininfo[9]       array of gain indexes
+ * @param gaininfo  array of gain indexes
  */
 
 static void decode_gain_info(GetBitContext *gb, int *gaininfo)