[docs] [issue43283] IDLE: Explain print slowness and speedup method

Change by miss-islington <mariatta.wijaya+miss-islington@gmail.com>: ---------- nosy: +miss-islington nosy_count: 2.0 -> 3.0 pull_requests: +23386 pull_request: https://github.com/python/cpython/pull/24607 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue43283> _______________________________________