[css-multicol-1][editorial] Don't use wpt-rest as it hides tests (and…

… also gives an html validity error)

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>