Add Prop connect docs

[adamdbradley]

@Prop({connect: 'ion-animation-controller'})

[jgw96]

Talked to Adam offline and we are going to hold off on documenting this for now as it may change in the nearish future with ES modules.

[juanmiguelbesada]

Hi!

Still trying to figure how connect works in stencil?

Any tip here please?

[rwaskiewicz]

Closing, as this API no longer applies