Under release notes, add more info on which releases are stable and unstable.

[Hyperpolarized]

Problem

Release notes not showing which releases are stable and not.

Proposal

Add more info on which releases are stable or not.

Checklist

• checked latest Nix manual (source)
• checked open documentation issues and pull requests for possible duplicates

Priorities

Add 👍 to issues you find important.

[fricklerhandwerk]

@Hyperpolarized what exactly do you mean by stable here? If that means which versions are released with Nixpkgs and NixOS, that information is displayed here: https://nix.dev/reference/nix-manual And arguably, the Nix codebase should not particularly care about that, except that maintainers should ensure that Nix actually works for each release.