[3.11] gh-116851: Remove "from ctypes import *" from a ctypes example (GH-116852) (GH-116906)

It is confusing, because libc is not imported from ctypes,
but defined in previous examples, which already contain the import.
(cherry picked from commit 744c077)

Co-authored-by: jnchen <caojingchen@live.com>

Author: miss-islington

Doc/library/ctypes.rst

@@ -92,7 +92,6 @@ Accessing functions from loaded dlls
 
 Functions are accessed as attributes of dll objects::
 
-   >>> from ctypes import *
    >>> libc.printf
    <_FuncPtr object at 0x...>
    >>> print(windll.kernel32.GetModuleHandleA)  # doctest: +WINDOWS