Clarify API and add examples for all methods (#20008)
Summary:
As a part of supporting writing data into TensorBoard readable format, we show more example on how to use the function in addition to the API docs.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20008
Reviewed By: natalialunova
Differential Revision: D15261502
Pulled By: orionr
fbshipit-source-id: 16611695a27e74bfcdf311e7cad40196e0947038
