Errata of broken URLs and typos for the Kea 2.4.0 release

There is a list of broken URLs and typos detected by https://jenkins.aws.isc.org/job/kea-dev/job/errata/Errata/.

The typos have more false positives, but the broken URLs are accurate enough. Here they are:

http://bind10.isc.org/wiki/IxfrSystemTests
http://bind10.isc.org/wiki/StatisticsItems
http://blogs.sun.com/sga/entry/boost_mini_howto
http://cdn.mathjax.org/mathjax/latest
http://googletest.googlecode.com/svn/trunk
http://kea.isc.org/wiki/IscForge
http://kea.isc.org/wiki/LFCDesign
http://oldkea.isc.org/ticket/2405
http://oldkea.isc.org/ticket/3265
http://oldkea.isc.org/ticket/5014
http://oldkea.isc.org/ticket/nnnn
http://www.archivum.info/mailing.openbsd.bugs/2009-02/00017/
http://www.domain.dom/ca-crl.pem
https://app.vagrantup.com/api/v1/box/
https://developer.apple.com/library/archive/featuredarticles/Doxy
https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
https://gitlab.isc.org/isc-projects/kea/merge_requests/new
https://jenkins.isc.org/job/kea-dev/job/performance/KeaPerformanceReport/
https://oldkea.isc.org/ticket/5543#comment:6
https://svn.boost.org/trac/boost/ticket/11989
https://svn.boost.org/trac/boost/ticket/3477
https://svn.boost.org/trac/boost/ticket/8080
https://www.comcast.com/
https://www.microsoft.com/en-us/download/details.aspx?id 21138
https://www.redhat.com/archives/libguestfs/2013-February/msg00102.html
https://www.tenforums.com/tutorials/51456-windows-server-2016-setup-local-domain-controller.html