Tests

Improve captcha documentation (#691) #510

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Job	Run time
docs	23s
mypy	24s
black	17s
pytest (3.8)	1m 19s
pytest (3.9)	1m 20s
pytest (3.10)	1m 15s
pytest (3.11)	1m 12s
pytest (3.12)	1m 25s
ruff	16s
pytest (3.13)	1m 23s
	9m 14s