Update the Mozilla Developer Network (MDN) link
Update the Mozilla Developer Network (MDN) link

References:

 * h5bp/html5-boilerplate#1484
 * https://hacks.mozilla.org/2013/12/the-mozilla-developer-network-has-a-new-face/

blackmoral/server-configs-apache,Gillespie59/server-configs-apache,walterebert/server-configs-apache,atyenoria/server-configs-apache,johnnyicarus/server-configs-apache,atyenoria/server-configs-apache,voku/server-configs-apache,h5bp/server-configs-apache,sengkoil/server-configs-apache,johnnyicarus/server-configs-apache,voku/server-configs-apache,StephanieMak/server-configs-apache,Gillespie59/server-configs-apache,sengkoil/server-configs-apache,walterebert/server-configs-apache,blackmoral/server-configs-apache,StephanieMak/server-configs-apache