[gilmishal]

Replaces the Administer users placeholder with provisioning, handle rules and collisions, organization roles, and access revocation. Includes the corrected examples of usernames that collide.

Part 3 of 6 in the documentation stack split from #103. Depends on #134; base: codex/onprem-user-identity. Review the diff against that base. The stack lands on docs/floxhub-onprem; publication to main is a separate change.

Merge order:

• Scaffold: docs(floxhub-onprem): scaffold the on-prem section #133
• User Identity: docs(floxhub-onprem): document identity integrations (ENT-361) #134
• User Administration: docs(floxhub-onprem): document user administration (ENT-360) #135
• Installation requirements: docs(floxhub-onprem): document installation requirements (ENT-340) #136
• Reference architectures: docs(floxhub-onprem): document reference architectures (ENT-344) #137
• Object storage: docs(floxhub-onprem): document object storage (ENT-352) #138

Includes this page's generated llms.txt entry.

Validation: regenerated llms.txt; checked commit scope and whitespace. Builds, previews, and tests were not run.

Tracks ENT-360.