minor typo: redundant term

Author: puentesarrin

source/core/replication.txt

@@ -245,7 +245,7 @@ that might create rollbacks.
       [replica set sync] replSet syncThread: 13410 replSet too much data to roll back
 
    In these situations you will need to manually intervene to either
-   save data manually, or resync from a "current" member of the set by
+   save data, or resync from a "current" member of the set by
    deleting the content of the existing :setting:`dbpath` directory to
    resume normal operation.