[css-sizing] typo

Author: tabatkins

css-sizing/Overview.bs

@@ -137,7 +137,7 @@ Auto Box Sizes</h3>
 				(See [[#intrinsic]].)
 
 		: <dfn>max-content size</dfn>
-		:: Roughly, the narrow <a>size</a> a box could take in a given axis while fitting around its contents
+		:: Roughly, the narrowest <a>size</a> a box could take in a given axis while fitting around its contents
 			if <em>none</em> of the soft wrap opportunities within the box were taken.
 
 			: <dfn>max-content inline size</dfn>