While it would seem that this is possible to alter this text by going to 
  1. Core > Settings > Custom Labels & Text > Custom Text/Messages
  2. Edit My Notifications: Intro Text
This is misleading, as this area was intended to change the text for an old Podium page which is no longer visible within the App.  Changing text in the Notification Settings page is currently not possible.  

This idea: https://blackbaudk12.ideas.aha.io/ideas/K12CO-I-99 has been added to the Ideas Portal looking to make changes like this possible in the future.