bpo-34429: Noted TemporaryFile behavior on non-Posix/non-Cygwin systems (GH-31547)

(cherry picked from commit 53ecf9e08d)

Co-authored-by: slateny <46876382+slateny@users.noreply.github.com>

Doc/library/tempfile.rst

@@ -62,6 +62,9 @@ The module defines the following user-callable items:
    The :py:data:`os.O_TMPFILE` flag is used if it is available and works
    (Linux-specific, requires Linux kernel 3.11 or later).
 
+   On platforms that are neither Posix nor Cygwin, TemporaryFile is an alias
+   for NamedTemporaryFile.
+
    .. audit-event:: tempfile.mkstemp fullpath tempfile.TemporaryFile
 
    .. versionchanged:: 3.5