docs

Add `from_date_string` as example Trino routine #7286

Job	Run time
path-filters	4s
docs-checks	5m 10s
test-docs (:trino-main)	21m 58s
test-docs (:trino-plugin-toolkit)	1m 11s
test-docs (:trino-resource-group-managers)	3m 5s
test-docs (:trino-tests)	2m 30s
	33m 58s

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