fix: correct typo in GenerateTypesOptions

[danielroe]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 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

A small typo. I've added a normalization step to ensure this isn't a breaking change.

📝 Checklist

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

[codecov]

Codecov Report

Merging #81 (4fcb045) into main (b4c13a3) will increase coverage by 0.04%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
+ Coverage   87.76%   87.81%   +0.04%     
==========================================
  Files           8        8              
  Lines        1112     1116       +4     
  Branches      283      283              
==========================================
+ Hits          976      980       +4     
  Misses        136      136              

Impacted Files	Coverage Δ
src/generator/dts.ts	93.11% <85.71%> (+0.10%)	⬆️

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[pi0]

nice find!