Update links to discontinued W3C document with a spec
Update links to discontinued W3C document with a spec

http://www.w3.org/TR/html-markup is marked as discontinued
dfockler/oga,jeffreybaird/oga,ttasanen/oga,YorickPeterse/oga,YorickPeterse/oga,dfockler/oga,altmetric/oga,ttasanen/oga,jeffreybaird/oga,ttasanen/oga,altmetric/oga,YorickPeterse/oga,ttasanen/oga,altmetric/oga,YorickPeterse/oga,altmetric/oga,dfockler/oga,dfockler/oga,jeffreybaird/oga,ttasanen/oga,altmetric/oga,jeffreybaird/oga,dfockler/oga,jeffreybaird/oga,YorickPeterse/oga