[css3-namespace] changed NAMESPACE_SYM token

I made a small change in http://dev.w3.org/csswg/css3-namespace/#syntax to  
the token production. It is now:

   @{N}{A}{M}{E}{S}{P}{A}{C}{E} {return NAMESPACE_SYM;}

This is more in line with CSS 2.1. For instance:

   @{I}{M}{P}{O}{R}{T} {return IMPORT_SYM;}

The letters are already part of the CSS 2.1 grammar.


-- 
Anne van Kesteren
<http://annevankesteren.nl/>
<http://www.opera.com/>