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docs/vmbackup: add information about cluster backups (#7244)

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### Describe Your Changes

Add more detailed information about performing backups for
VictoriaMetrics cluster setup.
More detailed explanation should help to address questions similar to
https://github.com/VictoriaMetrics/VictoriaMetrics/issues/7225

### Checklist

The following checks are **mandatory**:

- [x] My change adheres [VictoriaMetrics contributing
guidelines](https://docs.victoriametrics.com/contributing/).

Signed-off-by: Zakhar Bessarab <z.bessarab@victoriametrics.com>
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@ -127,6 +127,23 @@ which perform full object copy during server-side copying. This may be slow and
If the `-dst` already contains some data, then its' contents is synced with the `-origin` data. This allows making incremental server-side copies of backups.
### Backups for VictoriaMetrics cluster
`vmbackup` can be used for creating backups for [VictoriaMetrics cluster](https://docs.victoriametrics.com/cluster-victoriametrics/).
In order to perform a complete backup for the cluster, `vmbackup` must be run on each `vmstorage` node in cluster. Backups must
be placed into different directories on the remote storage in order to avoid conflicts between backups from different nodes.
For example, when creating a backup with 3 `vmstorage` nodes, the following commands must be run:
```sh
vmstorage-1$ /vmbackup -storageDataPath=</path/to/vmstorage-data> -snapshot.createURL=http://vmstorage1:8482/snapshot/create -dst=gs://<bucket>/vmstorage-1
vmstorage-2$ /vmbackup -storageDataPath=</path/to/vmstorage-data> -snapshot.createURL=http://vmstorage2:8482/snapshot/create -dst=gs://<bucket>/vmstorage-2
vmstorage-3$ /vmbackup -storageDataPath=</path/to/vmstorage-data> -snapshot.createURL=http://vmstorage3:8482/snapshot/create -dst=gs://<bucket>/vmstorage-3
````
Note that `vmbackup` needs access to data folder of every `vmstorage` node. It is recommended to run `vmbackup` on the same machine where `vmstorage` is running.
For Kubernetes deployments it is recommended to use [sidecar containers](https://kubernetes.io/docs/concepts/workloads/pods/sidecar-containers/) for running `vmbackup` on the same pod with `vmstorage`.
## How does it work?
The backup algorithm is the following: