Add save_all notation to webp

I just tried to use the WEBP writer to save an animation and was unable to without `save_all=true`. But that parameter was not mentioned in the documentation. This correction adds it.
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Eric Moyer 2020-10-26 18:44:04 -04:00 committed by GitHub
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@ -951,6 +951,10 @@ When calling :py:meth:`~PIL.Image.Image.save` to write a WebP file, the
following options are available when the ``save_all`` argument is present and following options are available when the ``save_all`` argument is present and
true. true.
**save_all**
If present and true, all frames of the image will be saved. If
not, then only the first frame of a multiframe image will be saved.
**append_images** **append_images**
A list of images to append as additional frames. Each of the A list of images to append as additional frames. Each of the
images in the list can be single or multiframe images. images in the list can be single or multiframe images.