Remove someone's telephone number from the /releases area

[grahamperrin]

Summary

Removal was requested around fifteen months ago; https://lists.freebsd.org/archives/freebsd-doc/2022-May/001790.html.

Regardless of the ages of the files: given the /releases location, I assume that releng should approve.

[grahamperrin]

Underlying branch https://github.com/grahamperrin/freebsd-doc/tree/jhs deleted.