docs: add snippet verification for docs/ pages #4207

Job	Run time
checks / doc-snippets	11s
checks / pre-commit	1m 17s
checks / test (3.11, lowest-direct, ubuntu-latest)	46s
checks / test (3.10, highest, ubuntu-latest)	48s
checks / test (3.10, lowest-direct, windows-latest)	2m 31s
checks / test (3.12, highest, ubuntu-latest)	50s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 0s
checks / test (3.11, highest, windows-latest)	2m 36s
checks / test (3.11, lowest-direct, windows-latest)	2m 22s
checks / test (3.13, lowest-direct, windows-latest)	2m 13s
checks / test (3.10, highest, windows-latest)	2m 35s
checks / test (3.12, lowest-direct, ubuntu-latest)	47s
checks / test (3.12, lowest-direct, windows-latest)	3m 12s
checks / test (3.12, highest, windows-latest)	3m 25s
checks / test (3.13, highest, windows-latest)	2m 26s
checks / test (3.11, highest, ubuntu-latest)	47s
checks / test (3.13, highest, ubuntu-latest)	47s
checks / test (3.13, lowest-direct, ubuntu-latest)	48s
all-green	3s
	29m 24s

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