📝 Update Getting Started section in docs

[cindywu]

Updates Getting Started > Arbitrary section in docs. Fixes a grammatical error and updates the sentence for conciseness. =)

Category:

• ✨ Introduce new features
• 📝 Add or update documentation
• ✅ Add or update tests
• 🐛 Fix a bug
• 🏷️ Add or update types
• ⚡️ Improve performance
• Other(s): ...

Potential impacts:

• Generated values
• Shrink values
• Performance
• Typings
• Other(s): ...

[codesandbox-ci]

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Sandbox	Source
@fast-check/examples	Configuration

[dubzzz]

Thanks a lot for the contribution 😃

Please run: yarn version:bump to mark fast-check as patch and all others as ignored

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.49%. Comparing base (ab9bbcc) to head (351adf3).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4858   +/-   ##
=======================================
  Coverage   93.49%   93.49%           
=======================================
  Files         207      207           
  Lines        5015     5015           
  Branches     1367     1314   -53     
=======================================
  Hits         4689     4689           
  Misses        326      326           

Flag	Coverage Δ
unit-tests	93.49% <ø> (ø)
unit-tests-18.x-Linux	93.49% <ø> (ø)
unit-tests-20.x-Linux	93.49% <ø> (ø)
unit-tests-latest-Linux	93.49% <ø> (ø)

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[dubzzz]

@cindywu Just in case you missed my comment: #4858 (comment)