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Updating HA repmgr docs to suggest 3 nodes

Aric Buerer requested to merge docs-ha-repmgr into master

What does this MR do?

Updates the HA architecture documentation to suggest 3 database nodes in order for repmgr to gracefully failover and prevent split brain. It also adds the full command for restoring a former primary as a standby in the repmgr cluster.

Review checklist

  • Your team's review (required)
  • PM's review (recommended, but not a blocker)
  • Technical writer's review (required)
  • Merge the EE-MR first, CE-MR afterwards
Edited by Achilleas Pipinellis

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