doc/ceph-volume add the lvm scan reference

Signed-off-by: Alfredo Deza <adeza@redhat.com>

diff --git a/doc/ceph-volume/lvm/scan.rst b/doc/ceph-volume/lvm/scan.rst
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+scan
+====
+This sub-command will allow to discover Ceph volumes previously setup by the
+tool by looking into the system's logical volumes and their tags.
+
+As part of the the :ref:`ceph-volume-lvm-prepare` process, the logical volumes are assigned
+a few tags with important pieces of information.
+
+.. note:: This sub-command is not yet implemented