Minor: Clarify which parquet options are used for reading/writing #29424

Job	Run time
cargo check	8m 15s
build with wasm-pack	2m 16s
Check cargo fmt	41s
cargo test (macos)	9m 22s
cargo test (macos-aarch64)	9m 5s
Verify MSRV (Min Supported Rust Version)	6m 30s
Verify Vendored Code	51s
cargo test (win64)	33m 55s
cargo examples (amd64)	12m 23s
cargo test (amd64)	9m 26s
cargo doc	3m 33s
clippy	5m 16s
check Cargo.toml formatting	2m 43s
cargo test hash collisions (amd64)	8m 59s
cargo test datafusion-cli (amd64)	3m 31s
Run sqllogictest with Postgres runner	3m 13s
cargo test pyarrow (amd64)	2m 49s
cargo test doc (amd64)	13m 32s
verify benchmark results (amd64)	10m 32s
check configs.md is up-to-date	2m 23s
	2h 29m 15s

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