edit align-content demo

Author: doyoe

properties/flex/align-content.htm

@@ -157,7 +157,7 @@ <h2 class="tit">示例：</h2>
 	display:-webkit-flex;
 	display:flex;
 	-webkit-flex-wrap:wrap;
-	flex-direction:wrap;
+	flex-wrap:wrap;
 	width:200px;height:200px;margin:0;padding:0;border-radius:5px;list-style:none;background-color:#eee;}
 .box li{margin:5px;padding:10px;border-radius:5px;background:#aaa;text-align:center;}
 #box{