Update the Channel#private? doc comment to no longer reference is_private
Update the Channel#private? doc comment to no longer reference is_private

meew0/discordrb,VxJasonxV/discordrb,megumisonoda/discordrb,Roughsketch/discordrb,meew0/discordrb,megumisonoda/discordrb,Roughsketch/discordrb,VxJasonxV/discordrb