systemd.tmpfiles.rules: Fix false info
systemd.tmpfiles.rules: Fix false info

As per https://www.freedesktop.org/software/systemd/man/tmpfiles.d.html the current description is missleading as it fails to mention volatile files and creation with deletion
NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs