Update note that the `group_id` validity is not an assumption but a requirement
Update note that the `group_id` validity is not an assumption but a requirement

ppy/osu-web,nanaya/osu-web,ppy/osu-web,nanaya/osu-web,ppy/osu-web,notbakaneko/osu-web,notbakaneko/osu-web,nanaya/osu-web,notbakaneko/osu-web,nanaya/osu-web,LiquidPL/osu-web,notbakaneko/osu-web,ppy/osu-web,LiquidPL/osu-web,LiquidPL/osu-web,ppy/osu-web,LiquidPL/osu-web,nanaya/osu-web,LiquidPL/osu-web,notbakaneko/osu-web