docs: add docs for cephfs

- specifically related to managing csi volumes for kubernetes

doc/ceph/README.md

@@ -78,11 +78,11 @@ Create a key with access to the new subvolume groups. Check if the user already
 
 If it doesnt:
 
-    sudo ceph auth get-or-create client.kubernetes-cephfs \
+sudo ceph auth get-or-create client.kubernetes-cephfs \
-      mgr 'allow rw' \
+  mgr 'allow rw' \
-      osd 'allow rw tag cephfs metadata=cephfs, allow rw tag cephfs data=cephfs' \
+  osd 'allow rw tag cephfs metadata=cephfs, allow rw tag cephfs data=cephfs' \
-      mds 'allow r fsname=cephfs path=/volumes, allow rws fsname=cephfs path=/volumes/csi_ssd_ec_6_2, allow rws fsname=cephfs path=/volumes/csi_ssd_ec_4_1' \
+  mds 'allow r fsname=cephfs path=/volumes, allow rws fsname=cephfs path=/volumes/csi_ssd_ec_6_2, allow rws fsname=cephfs path=/volumes/csi_ssd_ec_4_1' \
-      mon 'allow r fsname=cephfs'
+  mon 'allow r fsname=cephfs'
 
 If it does, use `sudo ceph auth caps client.kubernetes-cephfs ...` instead to update existing capabilities.