[css-sizing-3] Wording tweak w3c#4962

Author: fantasai

css-sizing-3/Overview.bs

@@ -298,10 +298,10 @@ Intrinsic Size Constraints</h3>
 		<dd>
 			A width:height ratio inherent to a box,
 			which biases various sizing algorithms
-			to produce a size consistent with that ratio
+			to produce a size consistent with that aspect ratio
 			insofar as possible while honoring other sizing inputs.
 			Unless otherwise specified,
-			a box’s [=preferred aspect ratio=] is its [=intrinsic aspect ratio=] if any
+			a box’s [=preferred aspect ratio=] is its [=intrinsic aspect ratio=] if it has one
 			and is applied to its [=content box=].
 			Most boxes do not have a [=preferred aspect ratio=].
 	</dl>