[css-contain-3][editorial] Clarify computed value of container-type (w3c#8643)

Author: mirisuzanne

css-contain-3/Overview.bs

@@ -392,7 +392,7 @@ Creating Query Containers: the 'container-type' property</h3>
 		Initial: normal
 		Inherited: no
 		Applies to: all elements
-		Computed value: the keyword ''container-type/normal'' or one or more of ''container-type/size'', ''container-type/inline-size''
+		Computed value: specified keyword
 		Animation type: not animatable
 	</pre>