message: docs: fix picker typo
diff: @@ -64,7 +64,7 @@ export default {
  ```html
  <van-field
  - v-model="result"
  + v-model="fieldValue"
  is-link
  readonly
  label="City"
  @@ -93,7 +93,7 @@ export default {
  { text: 'Indiana', value: 'Indiana' },
  { text: 'Maine', value: 'Maine' },
  ];
  - const result = ref('');
  + const fieldValue = ref('');
  const showPicker = ref(false);
  const onConfirm = ({ selectedOptions }) => {
  @@ -102,9 +102,9 @@ export default {
  };
  return {
  - result,
  columns,
  onConfirm,
  + fieldValue,
  showPicker,
  };
  },
  