gh-107924: document S_IFSOCK for os.mknod()

Signed-off-by: Christoph Anton Mitterer <[email protected]>

Author: calestyo

Doc/library/os.rst

@@ -2400,10 +2400,10 @@ features:
    Create a filesystem node (file, device special file or named pipe) named
    *path*. *mode* specifies both the permissions to use and the type of node
    to be created, being combined (bitwise OR) with one of ``stat.S_IFREG``,
-   ``stat.S_IFCHR``, ``stat.S_IFBLK``, and ``stat.S_IFIFO`` (those constants are
-   available in :mod:`stat`).  For ``stat.S_IFCHR`` and ``stat.S_IFBLK``,
-   *device* defines the newly created device special file (probably using
-   :func:`os.makedev`), otherwise it is ignored.
+   ``stat.S_IFCHR``, ``stat.S_IFBLK``, ``stat.S_IFIFO`` and ``stat.S_IFSOCK``
+   (those constants are available in :mod:`stat`).  For ``stat.S_IFCHR`` and
+   ``stat.S_IFBLK``, *device* defines the newly created device special file
+   (probably using :func:`os.makedev`), otherwise it is ignored.
 
    This function can also support :ref:`paths relative to directory descriptors
    <dir_fd>`.