Misc fixes to code in doc examples #2369

Job	Run time
ubuntu-latest, py311-test-oldestdeps	3m 2s
ubuntu-latest, py311-test-alldeps	2m 55s
ubuntu-latest, py312-test-alldeps-cov	7m 46s
macos-latest, py312-test-alldeps	2m 1s
M1 macos-14, py312-test-alldeps	2m 5s
windows-latest, py312-test-alldeps	4m 37s
ubuntu-latest, py312-test	5m 17s
ubuntu-latest, codestyle	16s
ubuntu-latest, pep517	21s
ubuntu-latest, bandit	15s
ubuntu-latest, py313-test-alldeps	7m 10s
(Allowed failure) ubuntu-latest, py313-test-devdeps	6m 19s
	42m 4s

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