Changed command text in 'ocis storage-users uploads delete-stale-nodes'

[mmattel]

References:
owncloud/ocis#11704 ([full-ci][OCISDEV-355] Fix delete stale nodes command)

• The command is codewise improved and the command/section text needs and update
• Needs an entry in maintenance/changed commands section

Previously, only the faulty node got deleted, which could cause issues when there are file versions present.
Now, when there are file versions present, after deleting the faulty node, nodes are rolled back to the latest functional version available.

[mmattel]

Mentioned in: owncloud/docs-main#128 (Add ocis 7.3 release notes)
Fixed in #1196 (Prepare changes for 7.3 (Balch) )