Grammar fix

Author: stennie

source/reference/command/resync.txt

@@ -9,7 +9,7 @@ resync
    The :dbcommand:`resync` command forces an out-of-date slave
    :program:`mongod` instance to re-synchronize itself. Note
    that this command is relevant to master-slave replication only. It does
-   no apply to replica sets.
+   not apply to replica sets.
 
    .. include:: /includes/warning-blocking-global.rst