Merge pull request #9594 from ruby/docs-discussions-and-versioning

Update contribution docs

Author: hsbt

doc/NEW_FEATURES.md

@@ -2,14 +2,14 @@
 
 ## Substantial Features
 
-To request substantial changes to Bundler or Bundler documentation, please refer to the [RFC repository](https://github.com/rubygems/rfcs). See the [README](https://github.com/rubygems/rfcs/blob/master/README.md) for detailed instructions on the RFC process.
+To request substantial changes to Bundler or Bundler documentation, please start a discussion in [GitHub Discussions](https://github.com/rubygems/rubygems/discussions).
 
 ## Contributing New Features
 
 To add a new feature to Bundler:
 
-1. **Discuss your idea** - [Open an issue](https://github.com/ruby/rubygems/issues/new) to discuss your proposed feature
-2. **Base on master branch** - We follow [SemVer](https://semver.org), so new features go in the master branch only, not old releases
+1. **Discuss your idea** - If the goal is already clear, link the existing [issue](https://github.com/rubygems/rubygems/issues) or [discussion](https://github.com/rubygems/rubygems/discussions) that covers it. Otherwise, post your idea in [GitHub Discussions](https://github.com/rubygems/rubygems/discussions) first so it can be talked through
+2. **Base on master branch** - Substantial new features go in the master branch only. Releases follow a rational versioning policy: major versions may break existing code, minor versions can change behavior or output while keeping existing functionality working, and tiny versions are mostly bug fixes that may include feature additions
 3. **Write tests** - Include at least one test covering your changes in your feature branch
 4. **Submit a pull request** - See [PULL_REQUESTS.md](PULL_REQUESTS.md) for detailed guidelines
 

doc/POLICIES.md

@@ -93,9 +93,9 @@ avoid breaking things, and we may even intentionally introduce this kind of
 cases. So be aware when using internals and ideally get in touch with us
 before doing so, so that we can help find the right APIs.
 
-## RFC guidelines
+## Discussing large changes
 
-Large changes often benefit from being written out more completely, read by others, and discussed. The [Bundler RFC repo](https://github.com/rubygems/rfcs) is the preferred place for that to happen.
+Large changes often benefit from being written out more completely, read by others, and discussed. [GitHub Discussions](https://github.com/rubygems/rubygems/discussions) is the preferred place for that to happen.
 
 ## Committer Access