immer-reducers.md better rule for state mutations

[Luk-z]

Update Linting State Mutations paragraph with better rule for slice files

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[markerikson]

Thanks!

[Luk-z]

@markerikson can you please add me to v1.9.2 contributors 😃
Thought it was automatic.

[markerikson]

FWIW, I normally only list code-specific PRs in release notes, just so that it's easier for folks to see what specific behavior changes were made. Docs PRs aren't considered part of a specific release.