Fix aten's native's folder docs. (#71395)
Summary:
Fixes typo's in `aten/src/ATen/native/README.md`. The following were the fixes:
- Update string type to `c10::string_view` instead of `std::string`.
- Update the link `torch/_python_dispatcher.py`, which was broken.
**Link to docs:** https://github.com/pytorch/pytorch/tree/master/aten/src/ATen/native/README.md
Thanks!
cc: mruberry kshitij12345
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71395
Reviewed By: mikaylagawarecki
Differential Revision: D33743229
Pulled By: mruberry
fbshipit-source-id: 9deebffede20bf68dfc8e45088c8ab2dffb7564c
(cherry picked from commit 8bedb2cb60aa62b189f6341cf2d92fe46e9f3f7a)
