Updated user guide for mail service task enhancement
Broadcasted -> broadcast
Merge pull request #216 from tstephen/mail

Mail updates to user guide
ACT-1712 Duplicate task when signal is sent to User Task
Merge pull request #217 from martin-grofcik/5.15-SNAP

ACT-1712 Duplicate task when signal is sent to User Task
Merge remote-tracking branch 'remote/master'