Drop some bogus Doxygen documentation.

libavcodec/vorbis_parser.h

@@ -32,9 +32,6 @@ typedef struct AVVorbisParseContext AVVorbisParseContext;
 
 /**
  * Allocate and initialize the Vorbis parser using headers in the extradata.
- *
- * @param avctx codec context
- * @param s     Vorbis parser context
  */
 AVVorbisParseContext *av_vorbis_parse_init(const uint8_t *extradata,
                                            int extradata_size);

libavutil/hwcontext.h

@@ -225,8 +225,6 @@ typedef struct AVHWFramesContext {
 /**
  * Allocate an AVHWDeviceContext for a given pixel format.
  *
- * @param format a hwaccel pixel format (AV_PIX_FMT_FLAG_HWACCEL must be set
- *               on the corresponding format descriptor)
  * @return a reference to the newly created AVHWDeviceContext on success or NULL
  *         on failure.
  */