Update control-flow.md (#408)

MarisaKirisame · Naupio Z.Y. Huang · commit 4592bb664b18 · 2016-05-25T16:55:07.000+08:00
diff --git a/quickstart/control-flow.md b/quickstart/control-flow.md
@@ -1,4 +1,4 @@
-# 控制流
+# 控制流(control flow)
 
 ## If
 
