EF 6 database first: How to update stored procedures?

Based on this answer by DaveD, these steps address the issue:

1. In your .edmx, rt-click and select Model Browser.
2. Within the Model Browser (in VS 2015 default configuration, it is a tab within the Solution Explorer), expand Function Imports under the model.
3. Double-click your stored procedure.
4. Click the Update button next to Returns a Collection Of – Complex (if not returning a scalar or entity)
5. Click okay then save your .edmx to reflect field changes to your stored procedure throughout your project.