Improve ockam relay list --help documentation #16685

Job	Run time
Rust - lint_cargo_readme	2m 0s
Rust - build	3m 47s
Rust - lint_cargo_fmt_check	1m 56s
Rust - check_cargo_update	2m 17s
Rust - test	14m 36s
Rust - build_docs	3m 13s
Rust - check_no_std	3m 31s
Rust - lint_cargo_clippy	3m 36s
Rust - test_nightly	11m 53s
Rust - build_examples	4m 32s
Rust - check_nightly	3m 22s
Rust - lint_cargo_deny	2m 8s
Rust - build_nightly	5m 27s
Rust - lint_cargo_toml_files	2m 4s
Rust - lint_docs_ockam_io_rust_examples	1m 50s
Rust - ockam_command_cross_build (linux_armv7)	14m 59s
Rust - test_ockam_command (linux_86)	5m 15s
Rust - ockam_command_cross_build (macos_silicon)	17m 7s
Rust - test_docs_rust_library_examples	0s
	1h 43m 33s

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