docs: describe MultipartFormFiles

[b-kamphorst]

MultipartFormFiles were implemented but not documented, so I thought I could contribute and give back to your nice work.

[danielgtaylor]

Thank you! 🚀

[Copilot]

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.78%. Comparing base (44aab0b) to head (e9e7a0d).
Report is 13 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #704   +/-   ##
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  Coverage   92.77%   92.78%           
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  Files          22       22           
  Lines        4915     4917    +2     
=======================================
+ Hits         4560     4562    +2     
  Misses        308      308           
  Partials       47       47           

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