doc/start: rewrite intro paragraph

Rewrite the first paragraph in doc/start/intro.rst.

Signed-off-by: Zac Dover <zac.dover@proton.me>
Co-authored-by: Anthony D'Atri <anthony.datri@gmail.com>
Signed-off-by: Zac Dover <zac.dover@proton.me>
(cherry picked from commit bea01d5f1469030253a3403dbb9e2c9fa97806ac)

diff --git a/doc/start/intro.rst b/doc/start/intro.rst
index e0e944b87dbd5aa4204bd6cfc9b3d702dfc00e75..3a50a8733676e27a828d7d90d29c22c5957e62b6 100644 (file)
--- a/doc/start/intro.rst
+++ b/doc/start/intro.rst
@@ -2,14 +2,24 @@
  Intro to Ceph
 ===============
 
-Whether you want to provide :term:`Ceph Object Storage` and/or
-:term:`Ceph Block Device` services to :term:`Cloud Platforms`, deploy
-a :term:`Ceph File System` or use Ceph for another purpose, all
-:term:`Ceph Storage Cluster` deployments begin with setting up each
-:term:`Ceph Node`, your network, and the Ceph Storage Cluster. A Ceph
-Storage Cluster requires at least one Ceph Monitor, Ceph Manager, and
-Ceph OSD (Object Storage Daemon). The Ceph Metadata Server is also
-required when running Ceph File System clients.
+Ceph can be used to provide :term:`Ceph Object Storage` to :term:`Cloud
+Platforms` and Ceph can be used to provide :term:`Ceph Block Device` services
+to :term:`Cloud Platforms`. Ceph can be used to deploy a :term:`Ceph File
+System`.  All :term:`Ceph Storage Cluster` deployments begin with setting up
+each :term:`Ceph Node` and then setting up the network. 
+
+A Ceph Storage Cluster requires the following: at least one Ceph Monitor and at
+least one Ceph Manager, and at least as many Ceph OSDs as there are copies of
+an object stored on the Ceph cluster (for example, if three copies of a given
+object are stored on the Ceph cluster, then at least three OSDs must exist in
+that Ceph cluster). 
+
+The Ceph Metadata Server is necessary to run Ceph File System clients.
+
+.. note::
+
+   It is a best practice to have a Ceph Manager for each Monitor, but it is not
+   necessary. 
 
 .. ditaa::