[css-scoping-2][editorial] Add acknowledgments senction

Author: mirisuzanne

css-scoping-2/Overview.bs

@@ -308,6 +308,15 @@ Additions Since Level 1</h3>
 	* The ''@scope'' rule for creating scoped stylesheets
 	* The definition of [=scope proximity=] in the cascade
 
+<h2 class="no-num" id="acknowledgments">Acknowledgments</h2>
+
+	Elika J. Etemad / fantasai,
+	Giuseppe Gurgone,
+	Keith Grant,
+	Lea Verou,
+	Nicole Sullivan,
+	and Theresa O'Connor
+	contributed to this specification.
 
 Privacy and Security Considerations {#priv-sec}
 ===============================================