History of JobGroup::kill 1 change

In crates/flow/src/syscall.rs, lines 446–448 on 5cf1e8aefbb6118abf4f6617a91ecd727ca92869ca79b30872f85a4a897e7175. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 446,448:crates/flow/src/syscall.rs.