Clarify references to nfs-experimental as a separate service, not a plan
Clarify references to nfs-experimental as a separate service, not a plan

[#159050331](https://www.pivotaltracker.com/story/show/159050331)

Signed-off-by: Maria Shaldibina <dc03896a0185453e5852a5e0f0fab6cbd2e026ff@pivotal.io>

cloudfoundry/docs-dev-guide