wrong error message when inspect getfile a custom module

Bug report

Bug description:

>>> import inspect
>>> import types
... custom_module = types.ModuleType('my_custom_module')
... 
>>> inspect.getfile(custom_module)
Traceback (most recent call last):
  File "<python-input-2>", line 1, in <module>
    inspect.getfile(custom_module)
    ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^
  File "/Users/yihong/repos/cpython/Lib/inspect.py", line 822, in getfile
    raise TypeError('{!r} is a built-in module'.format(object))
TypeError: <module 'my_custom_module'> is a built-in module

as the code it is a costom module but not a build-in module
the error message is wrong

CPython versions tested on:

CPython main branch

Operating systems tested on:

Other

Linked PRs

• gh-138543
• gh-143769

Reproduce the custom-module example and inspect Lib/inspect.py around line 822, where the incorrect message is raised. Verify the resulting error wording distinguishes a custom module from a built-in module; linked PRs gh-138543 and gh-143769 show that work is already underway.