Fill color doc updates (#994)

* updating docs for randomperspective

* my

* ci

torchvision/transforms/transforms.py

@@ -1016,7 +1016,8 @@ class RandomAffine(object):
         resample ({PIL.Image.NEAREST, PIL.Image.BILINEAR, PIL.Image.BICUBIC}, optional):
             An optional resampling filter. See `filters`_ for more information.
             If omitted, or if the image has mode "1" or "P", it is set to PIL.Image.NEAREST.
-        fillcolor (int): Optional fill color for the area outside the transform in the output image. (Pillow>=5.0.0)
+        fillcolor (tuple or int): Optional fill color (Tuple for RGB Image And int for grayscale) for the area
+            outside the transform in the output image.(Pillow>=5.0.0)
 
     .. _filters: https://pillow.readthedocs.io/en/latest/handbook/concepts.html#filters