Provide better advice on constraint validation instructions - HTML5.1 spec changes

Hi all,

after recent discussion on list [1] I made some changes [2] in the 5.1 spec
[3] to clarify use of title attribute with the pattern attribute


Please review at your leisure, feedback welcome and appreciated.


[1]
http://lists.w3.org/Archives/Public/public-html/2013Mar/thread.html#msg84
[2]
https://github.com/w3c/html/commit/ac43e0d77079f9d0431040c639721ed9a4265205 and
https://github.com/w3c/html/commit/8dc0ad321d1b78312ef4a180c1f9314b2d2ef147
[3]
http://www.w3.org/html/wg/drafts/html/master/forms.html#attr-input-pattern


with regards

SteveF <http://www.paciellogroup.com/resources/wat-ie-about.html>
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HTML 5.1 <http://www.w3.org/html/wg/drafts/html/master/>
 <http://www.paciellogroup.com/resources/wat-ie-about.html>