[css3-syntax] Handle the last component in the comma-separated list.

Author: tabatkins

css3-syntax/Overview.html

@@ -3903,7 +3903,8 @@ <h3 id=parse-a-comma-separated-list-of-componen><span class=secno>6.6.
     Instead, push <var>temp</var> into <var>val</var>. Create a new
     <var>temp</var>, and return to step 2.
 
-   <li> If the token stream is exhausted, return <var>val</var>.
+   <li> If the token stream is exhausted, push <var>temp</var> into
+    <var>val</var>, and return <var>val</var>.
   </ol>
 
   <h2 id=serialization><span class=secno>7. </span>Serialization</h2>

css3-syntax/Overview.src.html

@@ -3436,7 +3436,8 @@ <h3>
 
 		<li>
 			If the token stream is exhausted,
-			return <var>val</var>.
+			push <var>temp</var> into <var>val</var>,
+			and return <var>val</var>.
 	</ol>