[skip ci] update release.md (#896)

* [skip ci] update release.md

* [skip ci] minor edit

RELEASE.md

 ## Steps to do a release
 
+### New Approach
+- Go to the [fairscale release workflow](https://github.com/facebookresearch/fairscale/actions/workflows/release.yml) in Github actions.
+- In the __Run Workflow__ dropdown, select the branch from which you wish to release. The default value is __main__ and should be used in almost all cases.
+- In adherence to [Semantic Versioning]((https://semver.org/spec/v2.0.0.html)) enter one of the following three values for _Release Type_:
+  - _patch_
+  - _minor_
+  - _major_
+- Click __Run Workflow__.
+- Verify [fairscale/version.py](https://github.com/facebookresearch/fairscale/blob/main/fairscale/version.py) has been updated.
+- Verify a new [PyPI package](https://pypi.org/project/fairscale/) has been published.
+- Verify a new [Github release](https://github.com/facebookresearch/fairscale/releases) has been created.
+
+---
+### Old Approach
+
 - Update the CHANGELOG.md
 - Update "what's new" in README.md
 - If needed, update the PyTorch versions in README.md in the Testing section.