Don't have `redis-cluster` as possible cache/session adapter in docs (#30794)
This is because it doesn't exist as an adapter. The `redis` adapter
already handles Redis cluster configurations.
Fixes #30534.
(cherry picked from commit f135cb7c9457f7b9bdc43601f44757834573950f)
Conflicts:
docs/content/administration/config-cheat-sheet.en-us.md
does not exist in Forgejo
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