docs(guide): fix link to helpers module

[yoshi2no]

thank you for maintaining such a fantastic library!

This PR corrected the URL for the helpers module in the documentation.
the section can be found here

[netlify]

✅ Deploy Preview for fakerjs ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	6ae1aeb
🔍 Latest deploy log	https://app.netlify.com/sites/fakerjs/deploys/674a8c983ba27500081c784a
😎 Deploy Preview	https://deploy-preview-3289.fakerjs.dev
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.96%. Comparing base (5d5fe30) to head (6ae1aeb).
Report is 1 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #3289      +/-   ##
==========================================
- Coverage   99.97%   99.96%   -0.01%     
==========================================
  Files        2806     2806              
  Lines      217140   217140              
  Branches      982      981       -1     
==========================================
- Hits       217075   217068       -7     
- Misses         65       72       +7     

see 2 files with indirect coverage changes

[matthewmayer]

Good catch! Thank you

[ST-DDT]

Nicely spotted. Thanks for your contribution. ❤️