Chore: Update RPM docs to include beta release references (#85753)
* Update RPM docs to include beta release references
* andreas/update-installation-docs/ run lint
* Don't number lists
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Co-authored-by: jev forsberg <jev.forsberg@grafana.com>
(cherry picked from commit 3420e942ac)
Co-authored-by: Andreas Christou <andreas.christou@grafana.com>