[CSS21] Suggestion to remove confusing non-normative verbiage in section 10.3.8

The first sentence of section 10.3.8 [1] is:

   This situation is similar to the previous one, except that the element
   has an intrinsic width.

This sentence seems to be informative, not normative, and has confused at least 
one person into thinking that this section does not apply to replaced elements 
without an intrinsic width.  See 
<https://bugzilla.mozilla.org/show_bug.cgi?id=412679#c12> (down past all the 
quoted stuff).

I suggest just removing this sentence, since it has nothing to add to the 
normative part of the section.  The width computation is covered completely by 
step 1 in the list.

-Boris

[1] http://www.w3.org/TR/2007/CR-CSS21-20070719/visudet.html#abs-replaced-width