docs: document plus scheme convention

[alandefreitas]

fix #923

[cppalliance-bot]

An automated preview of the documentation is available at https://970.url.prtest2.cppalliance.org/index.html

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

2026-01-28 22:56:09 UTC

[cppalliance-bot]

GCOVR code coverage report https://970.url.prtest2.cppalliance.org/gcovr/index.html
LCOV code coverage report https://970.url.prtest2.cppalliance.org/genhtml/index.html
Coverage Diff Report https://970.url.prtest2.cppalliance.org/diff-report/index.html

Build time: 2026-01-28 23:07:28 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.11%. Comparing base (b54e9e8) to head (df6db92).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #970   +/-   ##
========================================
  Coverage    99.11%   99.11%           
========================================
  Files          162      162           
  Lines        10006    10027   +21     
========================================
+ Hits          9917     9938   +21     
  Misses          89       89           

Files with missing lines	Coverage Δ
doc/modules/ROOT/examples/unit/snippets.cpp	97.30% <100.00%> (+0.04%)	⬆️

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