Please find attached a patch for
http://docs.python.org/dev/install/index.html.
I think removing a statement is enough to make things clear.
About darwin additional directories I'm unsure whether it need further
documentation as it seems very platform-related.
This is the comment I found in site.py
# for framework builds *only* we add the standard Apple
# locations. Currently only per-user, but /Library and
# /Network/Library could be added too


Eventually I used this command in pth file to extend the scanned
directories:
"import site;
site.addsitedir('/System/Links/Libraries/python2.5/site-packages/', set())"

I think this is more maintainable and clear than changing site.py, but I
don't think it will be forward compatible.