doc/ceph-volume update create to indicate bluestore support

Signed-off-by: Alfredo Deza <adeza@redhat.com>
(cherry picked from commit 61ce8b4b844fcb64fc95373c5515de902a52fc8c)

diff --git a/doc/ceph-volume/lvm/create.rst b/doc/ceph-volume/lvm/create.rst
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+.. _ceph-volume-lvm-create:
+
+``create``
+===========
+This subcommand wraps the two-step process to provision a new osd (calling
+``prepare`` first and then ``activate``) into a single
+one. The reason to prefer ``prepare`` and then ``activate`` is to gradually
+introduce new OSDs into a cluster, and avoiding large amounts of data being
+rebalanced.
+
+The single-call process unifies exactly what :ref:`ceph-volume-lvm-prepare` and
+:ref:`ceph-volume-lvm-activate` do, with the convenience of doing it all at
+once.
+
+There is nothing different to the process except the OSD will become up and in
+immediately after completion.
+
+The backing objectstore can be specified with:
+
+* :ref:`--filestore <ceph-volume-lvm-prepare_filestore>`
+* :ref:`--bluestore <ceph-volume-lvm-prepare_bluestore>`
+
+All command line flags and options are the same as ``ceph-volume lvm prepare``.
+Please refer to :ref:`ceph-volume-lvm-prepare` for details.