message: [Doc] Stepper: update demo
diff: @@ -26,6 +26,24 @@ export default {
  }
  ```
  +### Step
  +
  +```html
  +<van-stepper v-model="value" step="2" />
  +```
  +
  +### Range
  +
  +```html
  +<van-stepper v-model="value" min="5" max="8" />
  +```
  +
  +### Integer
  +
  +```html
  +<van-stepper v-model="value" integer />
  +```
  +
  ### Disabled
  ```html
  @@ -66,19 +84,6 @@ export default {
  }
  ```
  -### Advanced Usage
  -
  -```html
  -<van-stepper
  - v-model="value"
  - integer
  - :min="5"
  - :max="40"
  - :step="2"
  - :default-value="9"
  -/>
  -```
  -
  ## API
  ### Props
  