[docs] [issue18576] Rename and document test.script_helper as test.support.script_helper

Seydou Dia added the comment: Since I am already on bugs.python.org/issue18578 I will tackle this issue, if you don't mind. ---------- nosy: +seydou _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue18576> _______________________________________