[css-align] Add Javier to acks

Author: fantasai

css-align/Overview.bs

@@ -1119,5 +1119,5 @@ Changes</h2>
 <h2 class=no-num id="acknowledgments">
 Acknowledgments</h2>
 
-	Special thanks goes to Markus Mielke, Alex Mogilevsky, and the
-	participants in the CSSWG's March 2008 F2F alignment discussions.
+	Special thanks goes to Javier Fernandez, Markus Mielke, Alex Mogilevsky,
+	and the participants in the CSSWG's March 2008 F2F alignment discussions.