Phone numbers and emails addresses marked as invalid links

[timobrembeck]

Describe the Bug

In the broken link checker, phone numbers and email addresses are marked as invalid links.
Although the status says "Phone number (not automatically checked)", it still creates the impression that something is wrong with these links.

Steps to Reproduce

1. Add phone number / email links in the content
2. See broken link checker

Expected Behavior

The phone numbers and emails should not be listed as broken links

Actual Behavior

they are

Additional Information