doxygen: Remove spurious documentation for non-existing function parameters.

libavcodec/h264idct_template.c

@@ -237,7 +237,6 @@ void FUNCC(ff_h264_idct_add8)(uint8_t **dest, const int *block_offset, DCTELEM *
 }
 /**
  * IDCT transforms the 16 dc values and dequantizes them.
- * @param qp quantization parameter
  */
 void FUNCC(ff_h264_luma_dc_dequant_idct)(DCTELEM *_output, DCTELEM *_input, int qmul){
 #define stride 16

libswscale/swscale.h

@@ -235,7 +235,6 @@ int sws_scale(struct SwsContext *context, const uint8_t* const srcSlice[], const
 
 /**
  * @param inv_table the yuv2rgb coefficients, normally ff_yuv2rgb_coeffs[x]
- * @param fullRange if 1 then the luma range is 0..255 if 0 it is 16..235
  * @return -1 if not supported
  */
 int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],