[Editorial] Minor fix to corner-shape shorthand (w3c#12661)

Author: noamr

css-borders-4/Overview.bs

@@ -672,8 +672,7 @@ The 'corner' shorthand</h4>
 		Animation type: see individual properties
 	</pre>
 
-	The 'corner' shorthand sets the 'corner-shape' and 'border-radius' longhands all together.
-
+	The 'corner' shorthand sets the 'corner-*-shape' and 'border-*-radius' longhands all together.
 
 <h4 id=corner-shape-rendering>
 Rendering 'corner-shape'</h4>