Update doc/manual/src/design/store/drvs/drvs.md
Update doc/manual/src/design/store/drvs/drvs.md

Co-authored-by: Matthieu Coudron <3844f1d97e4eb22cfcb1fbd6564bf47e54b58ba8@users.noreply.github.com>
NixOS/nix,NixOS/nix,NixOS/nix,NixOS/nix,NixOS/nix