[fix-remove-ceph-create-keys-dep_cp] docs.source.admin: Add admin documentation

The admin command did not have and documentation.

Signed-off-by: Owen Synge <osynge@suse.com>

diff --git a/docs/source/admin.rst b/docs/source/admin.rst
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+.. _admin:
+
+admin
+=======
+The ``admin`` subcommand provides an interface to add to the cluster's admin
+node.
+
+Example
+-------
+To make a node and admin node run::
+
+  ceph-deploy admin ADMIN [ADMIN..]
+
+This places the the cluster configuration and the admin keyring on the remote
+nodes.
+
+Admin node definition
+---------------------
+
+The definition of an admin node is that both the cluster configuration file
+and the admin keyring. Both of these files are stored in the directory
+/etc/ceph and thier prefix is that of the cluster name.
+
+The default ceph cluster name is "ceph". So with a cluster with a default name
+the admin keyring is named /etc/ceph/ceph.client.admin.keyring while cluster
+configuration file is named /etc/ceph/ceph.conf.