docs: add usage example for handleCors

[jolo-dev]

🔗 Linked issue

#744

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Added an example to the CORS Documentation

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.80%. Comparing base (a58d7c9) to head (560ca32).
Report is 69 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #747      +/-   ##
==========================================
+ Coverage   77.83%   79.80%   +1.97%     
==========================================
  Files          47       53       +6     
  Lines        4286     5314    +1028     
  Branches      611      674      +63     
==========================================
+ Hits         3336     4241     +905     
- Misses        933     1055     +122     
- Partials       17       18       +1     

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[pi0]

Thanks!