[DOC] Fix typo in KLDivLoss (#66583)
Summary:
Fix simple typo.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66583
Reviewed By: soulitzer
Differential Revision: D31653998
Pulled By: jbschlosser
fbshipit-source-id: e4fc91be297cc9a85099d7883b42436b5e3392d3
