[css-sizing-3] Fix copy-paste error. #4764

Author: fantasai

css-sizing-3/Overview.bs

@@ -452,7 +452,7 @@ Sizing Values: the <<length-percentage>>, ''width/auto'' | ''max-width/none'', '
 
 		<dt><dfn>max-content</dfn>
 		<dd>
-			Use the <a>min-content size</a> in the relevant axis;
+			Use the <a>max-content size</a> in the relevant axis;
 			for a box’s [=block size=],
 			unless otherwise specified,
 			this is equivalent to its [=automatic size=].