[docs] Usage example missing for torchvision.utils.draw_bounding_boxes

[vadimkantorov]

https://pytorch.org/vision/master/utils.html?highlight=draw_bounding_boxes#torchvision.utils.draw_bounding_boxes

Return type is not described.

Also, it says: If filled, Resulting Tensor should be saved as PNG image.. What does word filled refer to? Where would it be saved? To some file path? Or encoded into the output tensor?

[oke-aditya]

Nice points @vadimkantorov . We recently added these utils and they are bit on the rough edge.
We have these TODO points in #3364 . I wanted to add this PR after #3330 .

@datumbox Since it will take time to add segmentation mask utility. Should I quickly patch #3364 ?

[datumbox]

@oke-aditya Apologies for the delay. I'm currently OOO...

@fmassa Thoughts on how we could unblock Oke on his open PR or how to proceed?