[doc] Fix inconsistencies with linalg.pinv docs and deprecate pinverse (#51671)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/51671
Test Plan: Imported from OSS
Reviewed By: mruberry
Differential Revision: D26240534
Pulled By: heitorschueroff
fbshipit-source-id: 26e2a3cad2105e6e2b7779e785666b38597450c5
