gh-136437: Document `os.path.dirname` as accepting only pos-only (#136946)

diff --git a/Doc/library/os.path.rst b/Doc/library/os.path.rst
index 5b238ad2ffc8def3d1d96cbc79a59ec8591fb2b5..d59f91f2aa8000052a0f06971865beccf0d73384 100644 (file)
--- a/Doc/library/os.path.rst
+++ b/Doc/library/os.path.rst
@@ -118,7 +118,7 @@ the :mod:`glob` module.)
       Accepts a :term:`path-like object`.
 
 
-.. function:: dirname(path)
+.. function:: dirname(path, /)
 
    Return the directory name of pathname *path*.  This is the first element of
    the pair returned by passing *path* to the function :func:`split`.