Add documentation on the specific handling of CUDA

[mborland]

Closes: #143

[cppalliance-bot]

An automated preview of the documentation is available at https://145.safe-numbers.prtest3.cppalliance.org/libs/safe_numbers/doc/html/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2026-03-24 16:33:55 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.6%. Comparing base (89ae594) to head (71e666e).
⚠️ Report is 3 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop    #145   +/-   ##
=======================================
  Coverage     97.6%   97.6%           
=======================================
  Files          112     112           
  Lines         7942    7942           
  Branches      2976    2976           
=======================================
  Hits          7745    7745           
  Misses         131     131           
  Partials        66      66           

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