Fix doc test #2416

Job	Run time
cargo test (mac)	11m 40s
build with wasm-pack	1m 47s
Check cargo fmt	41s
cargo check	2m 56s
Verify MSRV	6m 44s
Verify Vendored Code	1m 1s
cargo test (win64)	27m 35s
cargo examples (amd64)	4m 21s
cargo test datafusion-cli (amd64)	6m 21s
check Cargo.toml formatting	2m 0s
clippy	8m 0s
cargo doc	3m 11s
cargo test hash collisions (amd64)	8m 27s
cargo test (amd64)	14m 21s
cargo test doc (amd64)	14m 32s
Run sqllogictest with Postgres runner	5m 35s
cargo test pyarrow (amd64)	3m 44s
verify benchmark results (amd64)	20m 22s
check configs.md is up-to-date	4m 4s
	2h 27m 22s

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