fix documentation for add_hparams (#27521)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/27521
adding new lines to add_hparams description
Test Plan: sphinx-autobuild
Reviewed By: orionr
Differential Revision: D17800387
fbshipit-source-id: 4a09a86a9d35c6c2d3a7e2857027f9d053851585
Author
Alexander Melnikov
