Add "can't modify read-only volumes" as a limitation, especially with respect to DP type volumes

[tespinoz-netapp]

Page URL

https://docs.netapp.com/us-en/ontap/smb-admin/limits-when-cli-set-file-folder-security-concept.html

Page title

Limits when using the CLI to set file and folder security

Summary

It makes sense to specify that read-only volumes (like DP-type volumes) can't have modifications applied to them, even via the ONTAP CLI, because they're in a read-only state.

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