Update router-instance.md (zh-cn) (#1652)

Added missing params for 'router.push' and 'router.replace'

Author: cyyyu

Diff for: docs/zh-cn/api/router-instance.md

@@ -29,8 +29,8 @@
   增加全局的导航钩子。参考 [导航钩子](../advanced/navigation-guards.md).
 
 
-- **router.push(location)**
-- **router.replace(location)**
+- **router.push(location, onComplete?, onAbort?)**
+- **router.replace(location, onComplete?, onAbort?)**
 - **router.go(n)**
 - **router.back()**
 - **router.forward()**