[css-anchor-position-1] Clarify that CB size changes don't clear last remembered option #12577

Author: fantasai

css-anchor-position-1/Overview.bs

@@ -2176,7 +2176,7 @@ laying out later boxes cannot change this decision.
 		if any of the following are true:
 
 		* Its computed 'position' value has changed,
-			its [=containing block=] has changed,
+			its [=containing block=] association has changed,
 			or it no longer generates a box.
 		* Its computed value for any [=longhand property|longhand=] of 'position-try' has changed.
 		* Its computed value for any [=accepted @position-try property=] has changed.