lavfi/pad,crop,scale: remove options description from filter description

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavfilter/vf_crop.c

@@ -334,7 +334,7 @@ static const AVFilterPad avfilter_vf_crop_outputs[] = {
 
 AVFilter avfilter_vf_crop = {
     .name          = "crop",
-    .description   = NULL_IF_CONFIG_SMALL("Crop the input video to width:height:x:y."),
+    .description   = NULL_IF_CONFIG_SMALL("Crop the input video."),
     .priv_size     = sizeof(CropContext),
     .priv_class    = &crop_class,
     .query_formats = query_formats,

libavfilter/vf_pad.c

@@ -394,7 +394,7 @@ static const AVFilterPad avfilter_vf_pad_outputs[] = {
 
 AVFilter avfilter_vf_pad = {
     .name          = "pad",
-    .description   = NULL_IF_CONFIG_SMALL("Pad input image to width:height[:x:y[:color]] (default x and y: 0, default color: black)."),
+    .description   = NULL_IF_CONFIG_SMALL("Pad the input video."),
     .priv_size     = sizeof(PadContext),
     .priv_class    = &pad_class,
     .query_formats = query_formats,

libavfilter/vf_scale.c

@@ -569,7 +569,7 @@ static const AVFilterPad avfilter_vf_scale_outputs[] = {
 
 AVFilter avfilter_vf_scale = {
     .name          = "scale",
-    .description   = NULL_IF_CONFIG_SMALL("Scale the input video to width:height size and/or convert the image format."),
+    .description   = NULL_IF_CONFIG_SMALL("Scale the input video size and/or convert the image format."),
     .init_dict     = init_dict,
     .uninit        = uninit,
     .query_formats = query_formats,