[css-conditional-5] Properly attach values to @container/scrolled (#12894)

The `direction` feature was renamed to `scrolled` in #12881, but feature
values were still referencing `direction`.

Author: tidoust

css-conditional-5/Overview.bs

@@ -1604,7 +1604,7 @@ Scrolled: the '@container/scrolled' feature</h4>
 	The logical values map to physical based on the direction and writing-mode of the [=query container=].
 	None of the values match if the container is not a [=scroll container=].
 
-	<dl dfn-type=value dfn-for="@container/direction">
+	<dl dfn-type=value dfn-for="@container/scrolled">
 		<dt><dfn>none</dfn>
 		<dd>
 			The [=query container=] has not had a [=relative scroll=] yet.