Fix minor problems in index_put_ docs (#33689)
Summary:
Fix for https://github.com/pytorch/pytorch/issues/33641
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33689
Differential Revision: D20086967
Pulled By: ngimel
fbshipit-source-id: d9dde8edb904de1cf56b9337920cb29e008b72fb
