[3.11] ctypes docs: fix missing not in variadic functions section (GH-102611) (#103425)

(cherry picked from commit 975d220)

Co-authored-by: mara004 <[email protected]>

Author: miss-islington

Doc/library/ctypes.rst

@@ -389,7 +389,7 @@ regular, non-variadic, function arguments:
 
    libc.printf.argtypes = [ctypes.c_char_p]
 
-Because specifying the attribute does inhibit portability it is advised to always
+Because specifying the attribute does not inhibit portability it is advised to always
 specify ``argtypes`` for all variadic functions.