Document min/max/minmax

[spinicist]

As on the discussions, documented when min/max/minmax will return a nullopt.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.29%. Comparing base (92616eb) to head (34f8eb2).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #232   +/-   ##
=======================================
  Coverage   98.29%   98.29%           
=======================================
  Files          69       69           
  Lines        2632     2632           
=======================================
  Hits         2587     2587           
  Misses         45       45           

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[tcbrindle]

Hi @spinicist, I finally got CI working again so I could check this! Looks good except for a tiny issue with a missing indent which I fixed.

Thanks very much, and apologies for the delay in merging this.

[spinicist]

Thanks @tcbrindle, great news that you fixed the CI