Fix the level of headers in pytorch/CONTRIBUTING.md (#28412)
Summary:
**Running Clang-Tidy**, **Pre-commit Tidy/Linting Hook**, **Building PyTorch with ASAN** shouldn't belong to **Windows development tips**.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/28412
Differential Revision: D19700228
Pulled By: ezyang
fbshipit-source-id: 39d999c68e4bd9264f4ae1fdab517871c883a663
