message: [Doc] fix radio doc
diff: @@ -44,10 +44,10 @@ export default {
  ```html
  <van-radio-group v-model="radio">
  <van-cell-group>
  - <van-cell :title="Radio 1" clickable @click="radio = '1'">
  + <van-cell title="Radio 1" clickable @click="radio = '1'">
  <van-radio name="1" />
  </van-cell>
  - <van-cell :title="Radio 2" clickable @click="radio = '2'">
  + <van-cell title="Radio 2" clickable @click="radio = '2'">
  <van-radio name="2" />
  </van-cell>
  </van-cell-group>
  