expose Timer docs to PyTorch website. (#46880)
Summary:
CC: gchanan jspisak seemethere
I previewed the docs and they look reasonable. Let me know if I missed anything.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46880
Reviewed By: seemethere, izdeby
Differential Revision: D24551503
Pulled By: robieta
fbshipit-source-id: 627f73d3dd4d8f089777bca8653702735632b9fc
