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docs: audit and correct API documentation

This commit corrects several inconsistencies in the API documentation
under `docs/api/`.

The following changes were made:
- Removed sections from `v1alpha1-sentinel.md` and `v1alpha1-user.md`
  that were documenting structs not present in their respective APIs.
- Corrected several fields in `core-types.md` to match the Go type
  definitions, including fields in `Storage`, `InstanceAccess`,
  and `ValkeyNode`.

This ensures that the API documentation is accurate and consistent with
the underlying code.