clarified language of doc for torch.mul (#15664)
Summary:
see issue #15636
Please note - I build the documents but the HTML is not updated with the edited content.
I did not also build the fork.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15664
Differential Revision: D13571310
Pulled By: soumith
fbshipit-source-id: d43be0f61705693d778cc12c13e86d6b06130ac7
