Here is a patch to remove a broken link from the end of the article. Besides, the two links refering to the handbook are wrong, too, but I don't know how to fix them. They contains entities, but I I don't know where that entities are defined.
Responsible Changed From-To: freebsd-doc->jcamou Take.
State Changed From-To: open->closed Patch committed, thanks!. The rest of the urls should be fixed now too.