Need to document what happens when a secondary email is deleted

Background

When you delete an Email record that is used for any of the associated User secondary emails, those secondary email values are un-set. As a result, the "default notification email" (the primary email) will be used for those secondary emails instead.

Problem to solve

Currently neither the API documentation nor the UI explains that deleting an Email record will cause the "default notification email to be used instead.

Proposal

The deletion behavior should be explained in both the API documentation and the UI: "Deleting an email address that is in use causes the default notification email address to be used instead."

Example of the current UI

The deletion behavior is not explained in the UI. After clicking the red "trash can" icon to delete, a JavaScript confirmation appears, which simply asks "Are you sure?"