[Doc] new theme

packages/password-input/en-US.md

@@ -1,16 +1,20 @@
-## PasswordInput
+# PasswordInput
+
+### Intro
+
 The PasswordInput component is usually used with [NumberKeyboard](#/en-US/number-keyboard) Component.
 
 ### Install
+
 ``` javascript
 import { PasswordInput, NumberKeyboard } from 'vant';
 
 Vue.use(PasswordInput).use(NumberKeyboard);
 ```
 
-### Usage
+## Usage
 
-#### Basic Usage
+### Basic Usage
 
 ```html
 <!-- PasswordInput -->
@@ -49,7 +53,7 @@ export default {
 }
 ```
 
-#### Without mask
+### Without mask
 
 ```html
 <van-password-input
@@ -59,6 +63,8 @@ export default {
 />
 ```
 
+## API
+
 ### Props
 
 | Attribute | Description | Type | Default |