pytorch

3b479228 - Improve documentation in dispatcher; remove unnecessary optional (#32533)

Improve documentation in dispatcher; remove unnecessary optional (#32533) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/32533 Applies renames based on comments in #32439. I also updated some other documentation and variable names while I was at it. Fixes #32435. Signed-off-by: Edward Z. Yang <ezyang@fb.com> Test Plan: Imported from OSS Differential Revision: D19579854 Pulled By: ezyang fbshipit-source-id: 85021a92a2a84501f49ee5c16318f81f5df64f8d