AI-35: rewording span-like BP and more

I had the action item to reword BP 14 based on Christian and Bartosz input.
http://www.w3.org/International/its/track/actions/35

It's done. See:
http://www.w3.org/International/its/techniques/its-techniques.html#DevSpan

I've implemented the changes from Christian's action item http://www.w3.org/International/its/track/actions/26.
See the bullet above the note that is just above the BP-1
http://www.w3.org/International/its/techniques/its-techniques.html#DevLang

PS: I'm not quite sure how to refer to 'http://www.xfront.com/ZeroOneOrManyNamespaces.html' as there are no authors, date, or other
info associated with it. Input welcome.

Cheers,
-yves