[docs] [issue31943] Add asyncio.Handle.cancelled() method

Change by Marat Sharafutdinov <decaz89@gmail.com>: ---------- title: Add asyncio.Handle.cancelled() and asyncio.TimerHandle.when -> Add asyncio.Handle.cancelled() method _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue31943> _______________________________________