Add docs to resize_ and resize_as_ (#35392)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/35392
Test Plan: Imported from OSS
Differential Revision: D20650097
Pulled By: VitalyFedyunin
fbshipit-source-id: cff4f555d355dfee42394f6070fe3e466949aeb5
