Where on docs.platform.sh should be changed?

shared/data/registry.json

What exactly should be updated?

When Valkey was initially added, it was not added in the normal way we add a new service. As such, it is missing from areas like https://docs.platform.sh/add-services.html#available-services.

We need to add it to shared/data/registry.json and rework associated valkey pages to work similar to other services, vs static information.

Additional context

No response