Documentation for `KarrasDiffusionSchedulers`

[williamberman]

I assume there's a general classification for the types of schedulers that can be added to this type. It would be helpful to add a quick blurb about why certain schedulers qualify as KarrasDiffusionSchedulers

[williamberman]

@kashif I see you named the type, could you advise here?

[kashif]

ok let me check! I can do this issue if its ok?

[williamberman]

Yep sure thing :)