doc: hacking: fixup nix-shell dependency comment

Dependencies

• [2] VISRZJXC doc: hacking: Quote perl5lib
• [3] 3JXCTKEC Add markdown files for documentation
• [4] DWMH6NFB docs: mention foreman under hacking

Change contents

• replacement in doc/manual/src/hacking.md at line 12
  [2.73]→[3.82:134](∅→∅),[3.82]→[3.82:134](∅→∅)
  − are set up so that those dependencies can be found:
  [2.73]

  [3.7023]
  + and dependencies can be found: