Rust

docs: move TopK user defined operator example into extending-operators guide #68109

Job	Run time
Check cargo fmt	1m 2s
linux build test	5m 56s
cargo test (macos-aarch64)	6m 43s
Verify MSRV (Min Supported Rust Version)	5m 52s
Verify Vendored Code	1m 23s
build and run with wasm-pack	6m 45s
cargo test datafusion-cli (amd64)	3m 26s
cargo check datafusion-substrait features	3m 13s
cargo check datafusion features	3m 14s
cargo check datafusion-proto features	3m 13s
cargo examples (amd64)	3m 17s
cargo check datafusion-functions features	2m 54s
cargo test doc (amd64)	3m 15s
cargo doc	3m 16s
cargo test (amd64)	3m 13s
Run sqllogictest in Substrait round-trip mode	3m 16s
Run sqllogictest with Postgres runner	3m 17s
check example README is up-to-date	3m 15s
check configs.md and ***_functions.md is up-to-date	3m 17s
clippy	3m 15s
verify benchmark results (amd64)	3m 16s
cargo check datafusion-common features	1m 51s
check Cargo.toml formatting	3m 14s
	1h 21m 23s

Provide feedback