message: docs(DropdownMenu): fix example source code error
diff: @@ -60,7 +60,7 @@ export default {
  ```html
  <van-dropdown-menu>
  - <van-dropdown-item v-model="value" :options="option" />
  + <van-dropdown-item v-model="value" :options="options" />
  <van-dropdown-item title="Title" ref="item">
  <van-cell center title="Title">
  <template #right-icon>
  