Update config-desc.md for c5448a4b59180fa7b8cd031b52b8ef21e9b718bc and bc79b31fa5128455d1aa3d9194fd84439098c776 (arthururls and alturls)

Signed-off-by: Martin Stone <martin@d7415.co.uk>
(cherry picked from commit 0b4be898b071ff71a25d4c06c7ce830278f84cc2)