message: docs(slider): merge vertical demo
diff: @@ -110,18 +110,9 @@ export default {
  ### Vertical
  ```html
  -<div :style="{ height: '100px' }">
  +<div :style="{ height: '150px' }">
  <van-slider v-model="value" vertical />
  -</div>
  -```
  -
  -### Vertical, Dual thumb mode
  -
  -Add `range` and `vertical` attributes at the same time, and make sure that the value of `value` is an array
  -
  -```html
  -<div :style="{ height: '120px' }">
  - <van-slider v-model="value" range vertical @change="onChange" />
  + <van-slider v-model="value2" range vertical @change="onChange" />
  </div>
  ```
  @@ -131,8 +122,8 @@ import { Toast } from 'vant';
  export default {
  data() {
  return {
  - // value must be an array
  - value: [10, 50],
  + value: 50,
  + value2: [10, 50],
  };
  },
  methods: {
  