docs(react): fix typo

[stefango]

https://react.formilyjs.org/api/shared/schema#attributes

Before submitting a pull request, please make sure the following is done...

• [x] Ensure the pull request title and commit message follow the Commit Specific in English.
• [x] Fork the repo and create your branch from master or formily_next.
• [x] If you've added code that should be tested, add tests!
• [x] If you've changed APIs, update the documentation.
• [x] Ensure the test suite passes (npm test).
• [x] Make sure your code lints (npm run lint) - we've done our best to make sure these rules match our internal linting guidelines.

Please do not delete the above content

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What have you changed?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (66ede1d) 99.55% compared to head (d5d64b9) 99.55%. Report is 1 commits behind head on formily_next.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## formily_next #4065 +/- ## ============================================= Coverage 99.55% 99.55% ============================================= Files 152 152 Lines 6720 6720 Branches 1822 1822 ============================================= Hits 6690 6690 Misses 30 30 ```

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