Updated docs/test for dot and vdot (#47242)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/47242
Test Plan: Imported from OSS
Reviewed By: ejguan
Differential Revision: D24733771
Pulled By: heitorschueroff
fbshipit-source-id: 92e3b0e28e0565918335fa85d52abe5db9eeff57
