remove wrong cheapter symbol

wayslog · wayslog · commit 82a862dc66fa · 2016-04-08T18:02:59.000+08:00
diff --git a/12-ownership-system/12-00-ownership_system.md b/12-ownership-system/12-00-ownership_system.md
@@ -1,4 +1,4 @@
-**13 所有权系统**
+**所有权系统**
 ===================
 
 
