fix handling of one-element arrays in doc code generator #1910

Job	Run time
windows_test	4m 49s
docker_build (linux/amd64)	5m 38s
docker_build (linux/arm64)	6m 0s
docker_build (linux/arm/v7)	5m 8s
test (mssql, mssql, mssql://root:[email protected]/sqlpage)	1m 46s
test (mysql, mysql, mysql://root:[email protected]/sqlpage)	1m 35s
test (postgres, postgres, postgres://root:[email protected]/sqlpage)	2m 7s
test (odbc, postgres, Driver=PostgreSQL Unicode;Server=127.0.0.1;Port=5432;Database=sqlpage;UID=r...	3m 42s
compile_and_lint	2m 14s
docker_push	23s
	33m 22s

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