[issue26868] Document PyModule_AddObject's behavior on error

[Brandt Bucher]

Change by Brandt Bucher <brandtbucher at gmail.com>:


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pull_requests: +15380
pull_request: https://github.com/python/cpython/pull/15725

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue26868>
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