Unit tests

DOC: add a doctest step to CI to allow writing testable code blocs, fix existing docstring code examples errors #3280

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Job	Run time
build (ubuntu-latest, 3.7, 1.21.4)	5m 58s
build (ubuntu-latest, 3.8, 1.21.4)	5m 38s
build (ubuntu-latest, 3.9, 1.21.4)	5m 32s
build (ubuntu-latest, 3.10, 1.22.4)	5m 57s
build (ubuntu-latest, 3.11, 1.25.2)	5m 32s
build (windows-latest, 3.11, 1.25.2)	10m 20s
build (macos-latest, 3.10, 1.25.2)	12m 37s
	51m 34s