preloadNSS: document the preload mechanism
preloadNSS: document the preload mechanism

Signed-off-by: Arthur Gautier <f88c5e35ba2b44ad8184caf58e04d88fd477a72f@superbaloo.net>

rycee/nix,rycee/nix,NixOS/nix,NixOS/nix,NixOS/nix,rycee/nix,rycee/nix,rycee/nix,NixOS/nix,NixOS/nix