Fix inport -> import typo in documentation (#53589)
Summary:
Fixes a small documentation typo
Pull Request resolved: https://github.com/pytorch/pytorch/pull/53589
Reviewed By: ngimel
Differential Revision: D26907045
Pulled By: Chillee
fbshipit-source-id: 15c35bec8d75dd897fe8886d0e0e1b889df65b24
