doc changes improvements

Author: sureshanaparti

source/adminguide/nas_plugin.rst

@@ -27,8 +27,8 @@ instances to any shared storage (NAS). It is based on `libvirt push backup mode
 to take full instance backups (qcow2) and requires libvirt-7.2.0 and QEMU-4.2,
 or high versions on the KVM hosts.
 
-Currently, only backup of VMs from the NFS, CEPH, Shared Mountpoint (backed by NFS)
-and local storage based Primary Storage are tested to work. All other Primary Storages
+Currently, only backup of VMs from the NFS, CEPH, File-based Shared Mountpoint
+and Local Storage based Primary Storage are tested to work. All other Primary Storages
 are not tested, backups on them may not work.
 
 The NAS B&R plugin requires admin to first add backup repositories which are
@@ -133,7 +133,7 @@ Instance backups are full disk backups and limited by libvirt's ability to
 initiate and handle backup. All such backups are exported and stored in qcow2
 format only. Due to this, restore operation for volumes of type raw, on CEPH based
 primary storage pools, are converted from qcow2 to raw format using qemu-img convert.
-Restore operation for volumes of type qcow2, on NFS and local storage based primary
+Restore operation for volumes of type qcow2, on NFS and Local Storage based primary
 storage pools, does not need such conversion as these can be directly copied.
 
 For running instances, their disks (of any format/storage type) are backed up by
@@ -144,8 +144,8 @@ For stopped instances, `qemu-img` is used to convert and export full-disk backup
 in qcow2 format to the backup repository.
 
 For restore operations, the KVM instance must be stopped in CloudStack.
-Currently, only volume(s) restoration is supported only to NFS, CEPH, Shared Mountpoint (backed by NFS)
-and local storage based primary storage pools, and restored volumes are fully backed disks (i.e.
+Currently, only volume(s) restoration is supported only to NFS, CEPH, File-based Shared Mountpoint
+and Local Storage based primary storage pools, and restored volumes are fully backed disks (i.e.
 not using any backing template file).
 
 Backup and restore operations are not fully supported for CKS cluster instances and should