removes master/slave reference

Author: terakilobyte

source/tutorial/backup-and-restore-mongodb-on-amazon-ec2.txt

@@ -419,7 +419,7 @@ After the filesystem is mounted you can decide to:
 
 After the database is started, it will be ready to transact. It will be
 at the specific point in time from the backup, so if it is part of a
-master/slave or replica set relationship, then the instance will need to
+primary/secondary or replica set relationship, then the instance will need to
 synchronize itself to get itself back up to date.
 
 See Also