[css-grid] Special credits to Peter Salas &co

Author: fantasai

css-grid/Overview.bs

@@ -3631,11 +3631,12 @@ Acknowledgements</h2>
 	Veljko Miljanic,
 	Mats Palmgren,
 	François Remy,
-	Peter Salas,
 	Sergio Villar Senin,
 	Christian Stockwell,
 	Eugene Veselov,
-	and the CSS Working Group members.
+	and the CSS Working Group members,
+	with special thanks to
+	Rossen Atanassov, Alex Mogilevsky, Phil Cupp, and Peter Salas of Microsoft for creating the initial proposal.
 	Thanks also to Eliot Graff for editorial input.
 
 <h2 class="no-num" id="changes">