[css-contain-3] Fix link

Author: fantasai

css-contain-3/Overview.bs

@@ -818,7 +818,7 @@ Style Container Features</h3>
 	unknown if the property or its value is unsupported,
 	and false otherwise.
 	The boolean syntax and logic combining [=style features=] into a <<style-query>>
-	is the same as for [=feature queries=].
+	is the same as for [=CSS feature queries=].
 	(See ''@supports''. [[!CSS-CONDITIONAL-3]])
 
 	Issue(6396): Do we like this proposed syntax for style queries?