Currently key value can be used for only global, osd, mon sections. this fix will allow to add key value to rgw section.

Closes-Bug: https://mirantis.jira.com/projects/PROD/issues/PROD-19503

Change-Id: I16d3720a2fd87ac326b69b562ef265ffcd8a3c2a
Signed-off-by: cdodda <cdodda@mirantis.com>
diff --git a/README.rst b/README.rst
index b7cd315..de5a105 100644
--- a/README.rst
+++ b/README.rst
@@ -431,6 +431,10 @@
 .. code-block:: yaml
 
     ceph:
+      common:
+        config:
+          rgw:
+            key: value
       radosgw:
         enabled: true
         hostname: gw.ceph.lab