Remove duplicate 'the' and link to worker engine section
Remove duplicate 'the' and link to worker engine section

Change-Id: I9c5c315359b93636af187b2619bec306d94e2a6d

junneyang/taskflow,openstack/taskflow,pombredanne/taskflow-1,jimbobhickville/taskflow,jimbobhickville/taskflow,openstack/taskflow,junneyang/taskflow,pombredanne/taskflow-1