Fix information about the Backup Service repositories in the documentation

In this section – https://docs.couchbase.com/server/current/learn/services-and-indexes/services/backup-service.html#repositories

It says:

A repository is a location that contains backed up data. The location must be accessible to all nodes in the cluster, and must be assigned a name that is unique across the cluster. A repository is defined with reference either to a specific bucket, or to all buckets in the cluster_. Data from each specified bucket will be backed up in the specified repository.

The information above regarding the location needs to be corrected – it should say:

           The location must be accessible to all nodes running the Backup Service, and ...

So, with the corrected sentence, it would be:

A repository is a location that contains backed up data. The location must be accessible to all nodes running the Backup Service and must be assigned a name that is unique across the cluster. A repository is defined with reference either to a specific bucket, or to all buckets in the cluster. Data from each specified bucket will be backed up in the specified repository.

cc James Lee Matt Hall