[GRASS-git] [OSGeo/grass] 4f4f6b: pythonlib: update script.setup docs (#2000)

[nilason]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: 4f4f6bd5d0bae0780939a2ffc8f36c4dde2a7bc4
      https://github.com/OSGeo/grass/commit/4f4f6bd5d0bae0780939a2ffc8f36c4dde2a7bc4
  Author: nilason <n_larsson at yahoo.com>
  Date:   2021-12-09 (Thu, 09 Dec 2021)

  Changed paths:
    M python/grass/script/setup.py

  Log Message:
  -----------
  pythonlib: update script.setup docs (#2000)

Now with correct instructions for mac
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