Filter personal information from being entered in the 'additional information' field

[JoshuaCarroll]

Is your feature request related to a problem? Please describe.
Repeater trustees have recently started putting personally identifying information (PII) in the "Additional Information" field. As this field is publicly viewable, it could open that person to scam phone calls or SPAM emails.

Describe the solution you'd like
Add a data validation check to ensure that the field doesn't contain anything that matches an email or phone number regular expression. If it does, then advise the user that these are not appropriate in that field (and explain why).

Describe alternatives you've considered
Remove the "additional information" field altogether.

Additional information
N/A