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Release notes for 9.12.1 should mention RISC-V NCG
## Summary The addition of RISC-V NCG should be mentioned in <https://gitlab.haskell.org/ghc/ghc/-/blob/ghc-9.12/docs/users_guide/9.12.1-notes.rst>. As a note, the release notes for 9.2.1 referred to AArch64 NCG: <https://downloads.haskell.org/ghc/9.2.1/docs/html/users_guide/9.2.1-notes.html#compiler>
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