doc: add changelog entry for PTRACE_O_EXITKILL
doc: add changelog entry for PTRACE_O_EXITKILL

MarkusJais/nix-rust,geofft/nix-rust,asomers/nix,xd009642/nix,xd009642/nix,asomers/nix,Susurrus/nix,geofft/nix-rust,carllerche/nix-rust,Susurrus/nix,nix-rust/nix,xd009642/nix,carllerche/nix-rust,Susurrus/nix,geofft/nix-rust,nix-rust/nix,MarkusJais/nix-rust,MarkusJais/nix-rust,carllerche/nix-rust