pacific: doc/cephadm: correct version staggered upgrade got in pacific

[adk3798]

Backport of #48007

This didn't end up making 16.2.10 so the first version it will actually be available is 16.2.11

Signed-off-by: Adam King adking@redhat.com
(cherry picked from commit 91befb1)

Contribution Guidelines

• To sign and title your commits, please refer to Submitting Patches to Ceph.

• If you are submitting a fix for a stable branch (e.g. "pacific"), please refer to Submitting Patches to Ceph - Backports for the proper workflow.

Checklist

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