fix(modal.mdx): fix spelling in modal documentation

[stefansurkamp]

• I have followed the Your First Code Contribution section of the Contributing guide

This PR fixes a small typo in the Modal documentation.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
flowbite-react	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 18, 2023 9:42am

[codecov]

Codecov Report

Patch coverage: 99.81% and project coverage change: -0.02 ⚠️

Comparison is base (7461173) 99.54% compared to head (32a306e) 99.53%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #862      +/-   ##
==========================================
- Coverage   99.54%   99.53%   -0.02%     
==========================================
  Files         163      166       +3     
  Lines        6621     6853     +232     
  Branches      401      412      +11     
==========================================
+ Hits         6591     6821     +230     
- Misses         30       32       +2     

Impacted Files	Coverage Δ
src/components/Dropdown/Dropdown.tsx	99.22% <99.41%> (-0.78%)	⬇️
src/components/Button/Button.tsx	100.00% <100.00%> (ø)
src/components/Button/ButtonBase.tsx	100.00% <100.00%> (ø)
src/components/Button/theme.ts	100.00% <100.00%> (ø)
src/components/Card/Card.tsx	100.00% <100.00%> (ø)
src/components/Carousel/Carousel.tsx	99.02% <100.00%> (+0.06%)	⬆️
src/components/DarkThemeToggle/DarkThemeToggle.tsx	100.00% <100.00%> (ø)
src/components/Dropdown/DropdownItem.tsx	100.00% <100.00%> (ø)
src/components/Dropdown/theme.ts	100.00% <100.00%> (ø)
src/components/Floating/Floating.tsx	100.00% <100.00%> (ø)
... and 11 more

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[tulup-conner]

Thank you for this!