[docs] [issue38623] Python documentation should mention how to find site-packages

Change by Inada Naoki <songofacandy@gmail.com>: ---------- pull_requests: +17278 pull_request: https://github.com/python/cpython/pull/17858 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue38623> _______________________________________