doc: update the usage of 'ceph-deploy purge'

Now it refuses to purge data directly before remove ceph package.
So update the order between commands when using it.

Signed-off-by: Yu Shengzuo <yu.shengzuo@99cloud.net>

diff --git a/doc/start/quick-ceph-deploy.rst b/doc/start/quick-ceph-deploy.rst
index 560d50b12c5e481929516b2f7a349c225a5d8d68..e2bf659753c910b1c8e242dba7184d9eb7c604e5 100644 (file)
--- a/doc/start/quick-ceph-deploy.rst
+++ b/doc/start/quick-ceph-deploy.rst
@@ -38,15 +38,12 @@ Create a Cluster
 ================
 
 If at any point you run into trouble and you want to start over, execute
-the following to purge the configuration::
+the following to purge the Ceph packages, and erase all its data and configuration::
 
+       ceph-deploy purge {ceph-node} [{ceph-node}]
        ceph-deploy purgedata {ceph-node} [{ceph-node}]
        ceph-deploy forgetkeys
 
-To purge the Ceph packages too, you may also execute::
-
-       ceph-deploy purge {ceph-node} [{ceph-node}]
-
 If you execute ``purge``, you must re-install Ceph.
 
 On your admin node from the directory you created for holding your