[css-multicol-1][editorial] Don't use wpt-rest as it hides tests (and also gives an html validity error)

Author: svgeesus

css-multicol-1/Overview.bs

@@ -163,6 +163,10 @@ Introduction</h2>
 		</pre>
 	</div>
 
+	<wpt>
+		multicol-fill-balance-029.html
+	</wpt>
+
 	This specification introduces ten new properties,
 	all of which are used in the examples above.
 
@@ -2230,4 +2234,7 @@ Acknowledgments</h2>
 	Tantek Çelik,
 	Till Halbach
 
-<wpt-rest></wpt-rest>
+	<wpt hidden>
+	crashtests/block-in-inline-become-float.html
+	crashtests/multicol-with-oof-in-multicol-with-oof-in-multicol.html
+	</wpt>