[css3-syntax] Updated the 'differences from 2.1' section to match my recent changes.

Author: tabatkins

css3-syntax/Overview.html

@@ -3735,24 +3735,13 @@ <h3 id=changes-from-css-2.1-core-grammar><span class=secno>5.13. </span>
      <li> [] blocks, () blocks and functions can now contain {} blocks,
       at-keywords or semicolons
 
-     <li> Property values, functions and all blocks can now contain cdo and
-      cdc
-
      <li> Selectors can now contain semicolons
 
-     <li> Selectors and at-rule predules can now contain cdo, cdc and
-      at-keywords
-
-     <li> Anything can contain an unmatched } ] or )
+     <li> Selectors and at-rule preludes can now contain at-keywords
     </ul>
 
    <li> Quirks mode parsing differences are now officially recognized in the
     parser.
-
-   <li> Selectors are no longer optional in rulesets a.k.a. style rules.
-    (Although an empty selector is invalid per css3-selectors, it does not
-    make ruleset invalid per the core grammar.)
-    <p class=issue> Do we want this? It's trivial to make it work.
   </ol>
 
   <h2 id=parser-entry-points><span class=secno>6. </span> Parser Entry Points</h2>

css3-syntax/Overview.src.html

@@ -3238,30 +3238,15 @@ <h3>
 				<li>
 					[] blocks, () blocks and functions can now contain {} blocks, at-keywords or semicolons
 
-				<li>
-					Property values, functions and all blocks can now contain cdo and cdc
-
 				<li>
 					Selectors can now contain semicolons
 
 				<li>
-					Selectors and at-rule predules can now contain cdo, cdc and at-keywords
-
-				<li>
-					Anything can contain an unmatched } ] or )
+					Selectors and at-rule preludes can now contain at-keywords
 			</ul>
 
 		<li>
 			Quirks mode parsing differences are now officially recognized in the parser.
-
-		<li>
-			Selectors are no longer optional in rulesets a.k.a. style rules. 
-			(Although an empty selector is invalid per css3-selectors, 
-			it does not make ruleset invalid per the core grammar.)
-
-			<p class='issue'>
-				Do we want this?  
-				It's trivial to make it work.
 	</ol>