[css-conditional-5] Add one additional WPT test to fix bikeshed warning.

Author: dbaron

css-conditional-5/Overview.bs

@@ -1947,6 +1947,10 @@ The <code>CSSContainerRule</code> interface</h3>
 	};
 	</pre>
 
+	<wpt>
+		container-queries/container-rule-cssom.html
+	</wpt>
+
 	<dl class='idl-attributes'>
 		<dt><code>conditionText</code> of type <code>CSSOMString</code> (CSSContainerRule-specific definition for attribute on CSSConditionRule)
 		<dd>The <code>conditionText</code> attribute (defined on the <code>CSSConditionRule</code> parent rule),