docs(rfc): update driver config baseline

Author: elezar

crates/openshell-driver-kubernetes/README.md

@@ -72,7 +72,7 @@ must provide the user-space libraries needed by the agent workload.
 
 ## Driver Config POC
 
-The RFC 0005 POC accepts the selected `SandboxTemplate.driver_config.kubernetes`
+The RFC 0006 POC accepts the selected `SandboxTemplate.driver_config.kubernetes`
 block as `DriverSandboxTemplate.driver_config`. The Kubernetes driver owns the
 nested schema and currently accepts: