Rust

Add a note on `coerce_list_children` #54

Job	Run time
cargo check	8m 11s
build with wasm-pack	2m 49s
Check License Header	2m 20s
cargo test (macos)	13m 14s
cargo test (macos-aarch64)	8m 22s
Verify Vendored Code	58s
Check cargo fmt	43s
cargo test (win64)	1h 4m 11s
Verify MSRV (Min Supported Rust Version)	8m 46s
check configs.md and ***_functions.md is up-to-date	3m 23s
cargo test hash collisions (amd64)	18m 21s
clippy	6m 47s
check Cargo.toml formatting	2m 55s
cargo test (amd64)	11m 44s
cargo doc	4m 36s
cargo test datafusion-cli (amd64)	4m 15s
cargo test doc (amd64)	16m 1s
cargo examples (amd64)	14m 30s
Run sqllogictest with Postgres runner	3m 51s
verify benchmark results (amd64)	13m 1s
cargo test pyarrow (amd64)	3m 5s
	3h 32m 3s

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