Fix doc build on catalog API #105

Job	Run time
cargo test (macos)	11m 13s
build with wasm-pack	2m 12s
Check cargo fmt	39s
cargo check	3m 29s
cargo test (macos-aarch64)	10m 19s
Verify MSRV (Min Supported Rust Version)	6m 16s
Verify Vendored Code	49s
cargo test (win64)	42m 15s
check Cargo.toml formatting	2m 58s
check configs.md is up-to-date	2m 46s
clippy	5m 2s
cargo test hash collisions (amd64)	9m 10s
cargo doc	3m 49s
cargo test (amd64)	9m 38s
cargo test datafusion-cli (amd64)	3m 47s
cargo test doc (amd64)	13m 57s
cargo examples (amd64)	12m 28s
cargo test pyarrow (amd64)	2m 46s
verify benchmark results (amd64)	10m 58s
Run sqllogictest with Postgres runner	3m 19s
	2h 37m 50s

Provide feedback