Clarify using object storage instead of NFS

What does this MR do?

The language in recommending object storage solutions "over NFS" caused some confusion to at least one customer, and myself upon reviewing it: It could be interpreted to mean that object storage should be layered on top of NFS, rather than using it in place of NFS, which is the intention as it makes more sense technically.

Related issues

Customer asked for clarification of this point on Ticket #176797.

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