MB-0 fix typo of param replica

Change-Id: I8dd3cc6eac9df4d51ab725ae3ba861e3bbf6a8de
Reviewed-on: http://review.couchbase.org/28713
Reviewed-by: Thuan Nguyen <soccon@gmail.com>
Tested-by: Thuan Nguyen <soccon@gmail.com>