doc/start: s/3/three/ in intro.rst

I'm changing "3" to "three" for two reasons:

1. It's correct.
2. This allows me to test backports into Octopus, Pacific, and Quincy.
   I am particularly interested to see what happens when I attempt
   the backport into Octopus, because backports into Octopus have
   failed. This will provide me with another unit of data.

Signed-off-by: Zac Dover <zac.dover@gmail.com>

diff --git a/doc/start/intro.rst b/doc/start/intro.rst
index a0549ea983746ceb52b73740cfe0edbe3f038a2e..1f1eb9b383e89c734a892ff77c0df5e3ce9a759f 100644 (file)
--- a/doc/start/intro.rst
+++ b/doc/start/intro.rst
@@ -38,8 +38,8 @@ required when running Ceph File System clients.
   ``ceph-osd``) stores data, handles data replication, recovery,
   rebalancing, and provides some monitoring information to Ceph
   Monitors and Managers by checking other Ceph OSD Daemons for a
-  heartbeat. At least 3 Ceph OSDs are normally required for redundancy
-  and high availability.
+  heartbeat. At least three Ceph OSDs are normally required for 
+  redundancy and high availability.
 
 - **MDSs**: A :term:`Ceph Metadata Server` (MDS, ``ceph-mds``) stores
   metadata on behalf of the :term:`Ceph File System` (i.e., Ceph Block