docs: add formily-antd-mobile doc link

[darkmice]

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

• Ensure the pull request title and commit message follow the Commit Specific in English.
• Fork the repo and create your branch from master or formily_next.
• If you've added code that should be tested, add tests!
• If you've changed APIs, update the documentation.
• Ensure the test suite passes (npm test).
• 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

---

What have you changed?

[codecov]

Codecov Report

Base: 96.36% // Head: 96.36% // No change to project coverage 👍

Coverage data is based on head (3ccdc80) compared to base (6e1c604).
Patch has no changes to coverable lines.

Additional details and impacted files

@@              Coverage Diff              @@
##           formily_next    #3527   +/-   ##
=============================================
  Coverage         96.36%   96.36%           
=============================================
  Files               152      152           
  Lines              6595     6595           
  Branches           1778     1778           
=============================================
  Hits               6355     6355           
  Misses              240      240           

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.