Document the unbind-system-db command and add details about the syste… #2643
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…m db in cluster (#2631)
Add a new page covering the
neo4j-admin dbms unbind-system-dbcommand. Add a section about thesystemdatabase role in a cluster to the page 'Managing databases in a cluster'.This PR should be copied to the 5.x branch with a few adjustments: the label
Introduced in 5.0should be added.