typos/grammar

Originally committed as revision 8641 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/bitstream.h

@@ -873,7 +873,7 @@ void free_vlc(VLC *vlc);
  * parses a vlc code, faster then get_vlc()
  * @param bits is the number of bits which will be read at once, must be
  *             identical to nb_bits in init_vlc()
- * @param max_depth is the number of times bits bits must be readed to completly
+ * @param max_depth is the number of times bits bits must be read to completely
  *                  read the longest vlc code
  *                  = (max_vlc_length + bits - 1) / bits
  */