minor additional tweaks to repl admin docs

Author: Sam Kleinman

source/administration/replica-sets.txt

@@ -4,11 +4,11 @@ Replica Set Administration
 
 .. default-domain:: mongodb
 
-:term:`Replica sets <replica set>` automate most
-administrative tasks associated with database replication.
-While most tasks have been automated, a few tasks remain that require administrator
-intervention mostly related to deployment and system management. This document
-provides an overview of those those tasks as well as a collection of troubleshooting
+:term:`Replica sets <replica set>` automate most administrative tasks
+associated with database replication.  Nevertheless, several
+operations related to deployment and systems management require
+administrator intervention remain. This document provides an overview
+of those tasks, in addition to a collection of troubleshooting
 suggestions for administers of replica sets.
 
 .. seealso::