doc: upate vue2.md (#122)

v-for和v-if不推荐一起使用,效率较低.推荐使用computed计算属性.
当两者一起使用时v-for具有较高的优先级.
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@ -634,6 +634,7 @@ Jane Doe
```
### v-for/v-if
[v-for和v-if不推荐一起使用](https://v2.cn.vuejs.org/v2/guide/conditional.html)
```html {2,3}
<li