Define audit-event open parameters consistently

as in
Doc/library/io.rst:   .. audit-event:: open path,mode,flags io.open
Doc/library/os.rst:   .. audit-event:: open path,mode,flags os.open
to avoid triggering a race-condition in Sphinx
that causes non-deterministic output.

See https://reproducible-builds.org/ for why this matters.

Fixes: #121874

This patch was done while working on reproducible builds for openSUSE, sponsored by the NLnet NGI0 fund.

Author: bmwiedemann

Doc/library/functions.rst

@@ -1509,7 +1509,7 @@ are always available.  They are listed here in alphabetical order.
    (where :func:`open` is declared), :mod:`os`, :mod:`os.path`, :mod:`tempfile`,
    and :mod:`shutil`.
 
-   .. audit-event:: open file,mode,flags open
+   .. audit-event:: open path,mode,flags open
 
    The ``mode`` and ``flags`` arguments may have been modified or inferred from
    the original call.