Text update for Ultra base navigation workflow

Blackboard Learn SaaS Continuous Delivery v3800.4.0 | Release to Production 5 March 2020
Ultra Experience

To increase confidence and clarity, we've added some text when administrators turn on the Ultra Experience. Now, when administrators activate Ultra base navigation, the message will include When you enable the Ultra experience, your existing courses aren’t affected. Your institution can choose to use the Original or Ultra Course View for new and existing courses.