[css-grid] Update acks

Author: fantasai

css-grid/Overview.bs

@@ -3165,18 +3165,23 @@ Acknowledgements</h2>
 	This specification is made possible by input from
 	Erik Anderson,
 	Rossen Atanassov,
+	Manuel Rego Casasnovas,
 	Arron Eicholz,
 	Sylvain Galineau,
 	Markus Mielke,
+	Daniel Holbert,
 	John Jansen,
 	Chris Jones,
 	Kathy Kam,
 	Veljko Miljanic,
+	Mats Palmgren,
+	François Remy,
 	Peter Salas,
+	Sergio Villar Senin,
 	Christian Stockwell,
 	Eugene Veselov,
 	and the CSS Working Group members.
-	Thanks to Eliot Graff for editorial input.
+	Thanks also to Eliot Graff for editorial input.
 
 <h2 class="no-num" id="changes">
 Changes</h2>