Clarify automatic shard rebalancing

[abdonpijpelink]

@ihorponom reported that, in the docs, three things could be more clear about automatic shard rebalancing:

• Rebalancing works constantly in the background; not just when scaling a cluster.
• Rebalancing is not per collection, but globally.
• When manually moving shards, the rebalancer may move your shard back. Disable the rebalancer if you want to manually assign shards.

This PR addresses that by making the following changes:

• cloud/configure-cluster.md — Rebalancing is continuous, not scaling-only; balances per-node across all collections; added warning that manual moves can be reverted.
• scaling/distributed_deployment.md — Same "continuous, not just on node add/remove" clarification; added a note that manual shard moves can be reverted.
• cloud/cluster-monitoring.md — Two FAQ entries updated to explain rebalancing is continuous and per-node-across-collections.
• hybrid-cloud/configure-scale-upgrade.md — Reworded to say rebalancing is continuous, not just tied to scaling.
• private-cloud/qdrant-cluster-management.md — Same continuous-rebalancing clarification plus the manual-move-reverted warning.

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[ihorponom]

Looks good overall; I would just change this part
deactivate automatic shard rebalancing by not selecting a value for the Shard Rebalance Strategy option.
Because to deactivate, we need to click the 'cross' and then save. (we can rephrase but it's the same sense)

#upd
I see in development we have changed it to Disable option in dropdown

[generall]

Because to deactivate, we need to click the 'cross' and then save.

This doesn't work for me, it just goes back to default.

[ihorponom]

Because to deactivate, we need to click the 'cross' and then save.

This doesn't work for me, it just goes back to default.

Yes, you are right, just checked on Prod.

But 'Disabled' option seems to work on Development

[abdonpijpelink]

I've pushed a change that changes the wording into "deactivate automatic shard rebalancing by selecting Disabled for the Shard Rebalance Strategy option", to match the new option in Dev. We can wait with merging this PR until that's been released to Prod.