ECS now has a dedicated toggle

[pmcarrion]

https://docs.controld.com/docs/ecs-custom-subnet

ECS now has a dedicated toggle. It was previously bundled in the DNSSEC toggle.
You might want to update the guide to reflect this new information.
I look forward to your recommendation regarding this new feature.

[yokoffing]

Thanks! I saw this recently, and I've been preparing for it on the back in. Just waiting on clarification on a few things from Control D.