Discuss `xlims!`, `ylims!`, and `limits!` in the Basic Tutorial?

[CameronBieganek]

These are pretty fundamental operations and a new user has no idea how to do them after reading the Basic Tutorial. Also, I'm not sure if these methods are discouraged in favor of axis = (limits = ..., ).

[jkrumbiegel]

Good point, the basic tutorial needs some more attention anyway