[css-contain] Editorial tweak of the computed value line of 'contain'

Author: frivoal

css-contain-1/Overview.bs

@@ -104,7 +104,7 @@ Strong Containment: the 'contain' property</h2>
 		Initial: none
 		Inherited: no
 		Applies to: See <a href="#contain-applies">below</a>
-		Computed value: specified keyword(s)<ins cite=#c1 class=c1>, except ''strict'' and ''content'' (see prose)</ins>
+		Computed value: <del cite=#c1 class=c1>specified keyword(s)</del><ins cite=#c1 class=c1>the keyword ''none'' or one or more of ''size'', ''layout'', ''paint''</ins>
 		Animation type: not animatable
 	</pre>
 

css-contain-2/Overview.bs

@@ -103,7 +103,7 @@ Strong Containment: the 'contain' property</h2>
 		Initial: none
 		Inherited: no
 		Applies to: See <a href="#contain-applies">below</a>
-		Computed value: specified keyword(s), except ''strict'' and ''content'' (see prose)
+		Computed value: the keyword ''none'' or one or more of ''size'', ''layout'', ''paint''
 		Animation type: not animatable
 	</pre>