Remove question mark from the link between NetBSD & Darwin.
As linked to in bug 26137 as a source
https://web.archive.org/web/20001012121507/http://www.opensource.apple.com/projects/darwin/faq.html
mentions:
"We already synchronize our code periodically with NetBSD for most of our user commands"

(cherry picked from commit 07fb2bcc245c52923889747f7262073f04383392)