Polish text around user site directories

Author: jasongrout

docs/changelog.rst

@@ -14,7 +14,7 @@ See the `jupyter_core
 4.9 <https://github.com/jupyter/jupyter_core/milestone/21?closed=1>`__
 milestone on GitHub for the full list of pull requests and issues closed.
 
-- Add Python site user base directory to config and data paths if ``site.ENABLE_USER_SITE`` is True (:ghpull:`242`)
+- Add Python site user base subdirectories to config and data user-level paths if ``site.ENABLE_USER_SITE`` is True. One way to disable these directory additions is to set the ``PYTHONNOUSERSITE`` environment variable. This location can be customized by setting the ``PYTHONUSERBASE`` environment variable. (:ghpull:`242`)
 
 
 4.8

jupyter_core/command.py

@@ -261,7 +261,7 @@ def main():
                     if site.ENABLE_USER_SITE:
                         print(f"Python's site.ENABLE_USER_SITE is True, so we add the user site directory '{site.getuserbase()}'")
                     else:
-                        print("Python's site.ENABLE_USER_SITE is False, so we do not add the Python site user directory")
+                        print(f"Python's site.ENABLE_USER_SITE is not True, so we do not add the Python site user directory '{site.getuserbase()}'")
 
                     # data path list
                     if env.get('JUPYTER_PATH'):