[issue35465] Document add_signal_handler

Andrew Svetlov added the comment: The proposal sounds great! Would you prepare a pull request for docs update? -- nosy: +asvetlov ___ Python tracker ___ __

[issue35465] Document add_signal_handler

New submission from Hrvoje Nikšić : In https://stackoverflow.com/q/53704709/1600898 a StackOverflow user asked how the add_signal_handler event loop method differs from the signal.signal normally used by Python code. The add_signal_handler documentation is quite brief - if we exclude the parts