media: uapi: Correct doc comment in H264 uAPI

struct v4l2_ctrl_h264_pps members obviously match picture parameter syntax,
not sequence parameter syntax.
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

include/uapi/linux/v4l2-controls.h

@@ -1329,7 +1329,7 @@ struct v4l2_ctrl_h264_sps {
  * struct v4l2_ctrl_h264_pps - H264 picture parameter set
  *
  * Except where noted, all the members on this picture parameter set
- * structure match the sequence parameter set syntax as specified
+ * structure match the picture parameter set syntax as specified
  * by the H264 specification.
  *
  * In particular, V4L2_H264_PPS_FLAG_SCALING_MATRIX_PRESENT flag