Make required cfg show up on docs.rs

[Shnatsel]

You can see an example of it in action on tinyvec documentation where they mark what functions require the alloc feature: https://docs.rs/tinyvec/latest/tinyvec/

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.16%. Comparing base (08eedcb) to head (a0c5fc9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #34   +/-   ##
=======================================
  Coverage   99.16%   99.16%           
=======================================
  Files           8        8           
  Lines         841      841           
=======================================
  Hits          834      834           
  Misses          7        7           

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