update readme files for nfs-client and syncExports to explain the user of variables

roles/nfs-client/vars/readme.txt

 ---
-# This is a list of exports, individual entry for each mount.
-exportList:
- - { name : '/mnt/test-nfs', src : '/mnt',fstype : 'nfs', opts : 'vers=3,noatime,rsize=16384,wsize=16384,hard,intr,tcp,nolock' , interface : 'tun0', srvopts: 'rw,sync,root_squash' }
- - { name : '/mnt/test-volume', src : '/mnt/vdc',fstype : 'nfs', opts : 'vers=3,noatime,rsize=16384,wsize=16384,hard,intr,tcp,nolock' , interface : 'tun0', srvopts: 'rw,sync,root_squash' }
+# This is a list of mounts to make
+nfsMounts:
+ - { mntpt: '/home' src:"{{ hostvars[groups['ManagementNodes'][0]]['ansible_eth0']['ipv4']['address'] }}:/cinderVolume/home", opts: "defaults", fstype: "nfs4" }
+

roles/syncExports/vars/readme.txt

 ---
-groupList:
-  - { name : 'openvpn-clients', interface : 'tun0' }
+# This is a list of directorys to export and where to export them too
+# interface referst to an interface name which must be present on all members
+# of the group mounting the export (as opposed to the interface on the server
+# which is irrelevant).
+# group is a group of nodes (ansible group) authorised to mount the export
+exportList:
+  - { src: '/cinderVolume/home', srvopts: 'fsid=1,rw,no_root_squash,sync', 'opts': 'defaults,nofail', group: 'DesktopNodes', interface: 'eth0' }