User documentation: Generate docs from macros, make`DocumentationBuilder::build` infallable #35286

Job	Run time
Check License Header	2m 10s
cargo check	1m 30s
Check cargo fmt	38s
build with wasm-pack	1m 55s
cargo test (macos)	2m 8s
cargo test (macos-aarch64)	2m 16s
Verify MSRV (Min Supported Rust Version)	5m 47s
Verify Vendored Code	55s
cargo test (win64)	5m 32s
cargo examples (amd64)	0s
cargo test (amd64)	0s
cargo test datafusion-cli (amd64)	0s
check Cargo.toml formatting	0s
clippy	0s
check configs.md and ***_functions.md is up-to-date	0s
cargo test hash collisions (amd64)	0s
cargo doc	0s
cargo test doc (amd64)	0s
Run sqllogictest with Postgres runner	0s
cargo test pyarrow (amd64)	0s
verify benchmark results (amd64)	0s
	22m 51s

Provide feedback