[css3-syntax] updated the 2.1 diffs

Author: tabatkins

css3-syntax/Overview.html

@@ -2832,6 +2832,13 @@ <h3 id=changes-from-css-2.1-core-grammar><span class=secno>3.7. </span>
     actually necessary (the Selectors parser can handle them as two DELIM
     tokens just as well) and it's confusing to have them show up in the Core
     Grammar when the other types of attribute selector options don't.
+
+   <li> The handling of some miscellanous ‘<code
+    class=property>special</code>’ tokens (like an unmatched } token)
+    showing up in various places in the grammar has been specified with some
+    reasonable behavior shown by at least one browser. Previously,
+    stylesheets with those tokens in those places just didn't match the
+    stylesheet grammar at all, so their handling was totally undefined.
   </ol>
   <!--
     

css3-syntax/Overview.src.html

@@ -2842,6 +2842,14 @@ <h3>
 			(the Selectors parser can handle them as two DELIM tokens just as well)
 			and it's confusing to have them show up in the Core Grammar
 			when the other types of attribute selector options don't.
+
+		<li>
+			The handling of some miscellanous 'special' tokens
+			(like an unmatched } token)
+			showing up in various places in the grammar
+			has been specified with some reasonable behavior shown by at least one browser.
+			Previously, stylesheets with those tokens in those places just didn't match the stylesheet grammar at all,
+			so their handling was totally undefined.
 	</ol>