pytorch

e085c55e - Fix `\\` warnings/errors when building optim documentation (#32911)

Fix `\\` warnings/errors when building optim documentation (#32911) Summary: This PR fixes the warnings and errors attributed to the use of `\\` outside of a proper environment. While rendered correctly in the documentation, it produces the warning ``` LaTeX-incompatible input and strict mode is set to 'warn': In LaTeX, \\ or \newline does nothing in display mode [newLineInDisplayMode] ``` on the CI tools and errors with ``` ParseError: KaTeX parse error: Expected 'EOF', got '\\' at position (x): ... ``` when not set to warn. This PR also makes minor formatting adjustments. The `CosineAnnealingLR` documentation has been adjusted to remove an unnecessarily large fraction and to improve spacing. The `SGD` documentation has been adjusted so that variables are consistently typeset and so that it follows the convention of punctuating equations. I attached images of the current documentation, the new documentation and a marked version to highlight differences. * SGD: New:  Current:  Marked new:  * CosineAnnealingLR: New:  Current:  Marked new:  Pull Request resolved: https://github.com/pytorch/pytorch/pull/32911 Differential Revision: D19697114 Pulled By: ezyang fbshipit-source-id: 567304bd4adcfa4086eae497cb818cf74375fe5d