[docs] [issue35465] [asyncio] Document loop.add_signal_handler

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:


New changeset e3666fc8effb05b555121f4ab7388df59e21f8b4 by Yury Selivanov (Hrvoje Nikšić) in branch 'master':
bpo-35465: Document _UnixSelectorEventLoop.add_signal_handler. (GH-11145)
https://github.com/python/cpython/commit/e3666fc8effb05b555121f4ab7388df59e21f8b4


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