Update docs and example for NFS Plugin
Modified the wording around how many Volumes exist
Cleaned up the text around the NFS Pod description
Fixed Spelling mistake on read-only
* If you want to test this out when an actual NFS export a good place
to start is by running the NFS server in a container:
docker run -d --name nfs --privileged cpuguy83/nfs-server /tmp
More detail can be found here:
https://github.com/cpuguy83/docker-nfs-server