History of JobGroup::kill 1 change

In crates/flow/src/syscall.rs, lines 446–448 on 8bf49b95b09e44880ae317bf6ad6de2c3c4166698a18a93fd53b7520c48bcc5a. 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.