[css-scoping-2][editorial] Fix incorrect example

Author: mirisuzanne

css-scoping-2/Overview.bs

@@ -266,10 +266,10 @@ Scoping Styles in CSS: the ''@scope'' rule</h3>
 		The following selectors have the same specificity (1,0,1):
 
 		<pre class=lang-css>
+		#hero img { border-radius: 50%; }
+
 		@scope (#hero) {
-		  /* When missing, the :scope ancestor is implied */
 		  img { border-radius: 50%; }
-		  :scope img { border-radius: 50%; }
 		}
 		</pre>
 	</div>