[DOCU-2595] decK upgrade guide: correct descriptions for sync, diff, validate #4666
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Summary
Adjusting description for decK diff, sync, and validate command behavior in 3.0.
Reason
DOCU-2595
Previously the doc had two different descriptions for self-managed vs Konnect control planes for the sync, diff, and validate commands. The Konnect description was incomplete + misleading, so I fixed that, then tested all of the documented scenarios on Konnect and on a self-managed gateway instance and came to the conclusion that the control plane type (konnect vs self-managed) doesn't actually matter here. What makes the difference is the format version in the config file and the validity of the routes.
Testing
Netlify