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
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**
A list of images to append as additional frames. Each of the
images in the list can be single or multiframe images.