Simplify list

Author: mfreed7

cssom-1/Overview.bs

@@ -1100,8 +1100,7 @@ Each {{DocumentOrShadowRoot}} has an associated list of zero or more <a>CSS styl
 <dfn export for=DocumentOrShadowRoot>final CSS style sheets</dfn>. This is
 an ordered list that contains:
 <ol>
-  <li>Any <a>CSS style sheets</a> created from HTTP <code>Link</code> headers, in header order</li>
-  <li>Any <a>CSS style sheets</a> associated with the {{DocumentOrShadowRoot}}, in <a>tree order</a></li>
+  <li>The <a>document or shadow root CSS style sheets</a>.</li>
   <li>The contents of {{DocumentOrShadowRoot}}'s {{DocumentOrShadowRoot/adoptedStyleSheets}}'
   [=observable array attribute/backing list=], in array order.</li>
 </ol>