GH-30582 broke doc tests in 3.11 branch:

File "library/enum.rst", line ?, in default
Failed example:
    Color(0)
Exception raised:
    Traceback (most recent call last):
      File "/home/runner/work/cpython/cpython/Lib/doctest.py", line 1346, in __run
        exec(compile(example.source, filename, "single",
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "<doctest default[0]>", line 1, in <module>
        Color(0)
        ^^^^^
    NameError: name 'Color' is not defined