Updating HA repmgr docs to suggest 3 nodes
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![doc/administration/img/high_availability/fully-distributed.png](https://lab.nexedi.cn/nexedi/gitlab-ce/-/raw/fd696d95692d83fef3d4c6d5736f5e25a2476e32/doc/administration/img/high_availability/fully-distributed.png)
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![doc/administration/img/high_availability/horizontal.png](https://lab.nexedi.cn/nexedi/gitlab-ce/-/raw/fd696d95692d83fef3d4c6d5736f5e25a2476e32/doc/administration/img/high_availability/horizontal.png)
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