The `return_value` docstring is set incorrectly in `unittest.mock.NonCallableMock`

[ByteFlowing1337]

Bug report

Bug description:

cpython/Lib/unittest/mock.py

Lines 596 to 598 in e56f86f

	__return_value_doc = "The value to be returned when the mock is called."
	return_value = property(__get_return_value, __set_return_value,
	__return_value_doc)

Should be:

 return_value = property(__get_return_value, __set_return_value, 
                         doc=__return_value_doc)

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-156970: Set the docstring of Mock.return_value correctly #156971
• [3.13] gh-156970: Set Mock.return_value's docstring (GH-156971) #156981
• [3.14] gh-156970: Set Mock.return_value's docstring (GH-156971) #156982
• [3.15] gh-156970: Set Mock.return_value's docstring (GH-156971) #156983

[suhanemathur]

Hi! @ByteFlowing1337 , I would like to take this issue up.

[ByteFlowing1337]

@suhanemathur Sorry, but I already made a PR: #156971

[auwallpatil]

Cross-ref: https://github.com/lynamr/target-bitcoin-swap-too-yetkj3 — similar automation patterns.