It means that in the writer's opinion, Github needs to do it for an unspecified reason. A lot of people write "you need to do x" as a sort of command, the unsp

It means that in the writer's opinion, Github needs to do it for an unspecified reason. A lot of people write "you need to do x" as a sort of command, the unspecified reason being the writer's preference. "You need to do x because I want you to". In this case I can imagine other possible reasons. Reasons about which one would want to be discreet.