Update the revision management how-to to use the `charmcraft promote` command
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### What needs to get done
`manage-revisions.rst` doesn't currently use the promote command, but rather only gets stuff from the charming-actions GH actions.
To wit:
- Wherever charming-actions is mentioned, mention promote command.
- Possibly replace charming-actions?
### Why it needs to get done
New promote command. We should encourage using it!
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