Fix error in grammar for :not() <http://lists.w3.org/Archives/Public/www-style/2009Oct/0209.html>

Author: fantasai

selectors3/Overview.html

@@ -2612,7 +2612,7 @@ <h3><a name=lex>10.2. Lexical scanner</a></h3>
 {w}"&gt;"           return GREATER;
 {w}","           return COMMA;
 {w}"~"           return TILDE;
-":{N}{O}{T}("    return NOT;
+":"{N}{O}{T}"("  return NOT;
 @{ident}         return ATKEYWORD;
 {invalid}        return INVALID;
 {num}%           return PERCENTAGE;