Merge pull request #545 from bgrabar/typo-977

DOCS-977 sentence fragment

Author: Ed Costello

source/release-notes/2.4-upgrade.txt

@@ -72,9 +72,6 @@ procedure.
    :program:`mongos` processes will fail to start until the upgrade
    process is complete.
 
-   in the sharded cluster will
-   fail to start.
-
    The upgrade will prevent any chunk moves or splits from occurring
    during the upgrade process. If there are very many sharded
    collections, acquiring the locks for all collections may take
@@ -120,7 +117,7 @@ To resync the config servers:
 
 1. Turn off the :ref:`balancer <sharding-balancing-internals>` in the
    sharded cluster and stop all metadata operations. If you are in the
-   middle of an upgrade process (:ref:`upgrade-cluster-upgrade`,) you
+   middle of an upgrade process (:ref:`upgrade-cluster-upgrade`), you
    have already disabled the balancer.  .
 
 #. Shut down two of the three config servers, preferably the last two listed