Expand the Creation Failed reasons

Signed-off-by: Yuki Iwai <[email protected]>

docs/proposals/2170-kubeflow-training-v2/README.md

@@ -990,6 +990,12 @@ stateDiagram-v2
     Completed=True --> [*]
 ```
 
+In the above state transition, the `Created=False` will happen in the following situations and
+those different situations can be identified by the condition reasons (`.status.conditions.[type="Created"].reason`).
+
+- `JobsBuildFailed`: When the TrainJob controller failed to construct objects (resources) using the [runtime framework interfaces](../../../pkg/runtime.v2/framework/interface.go)
+- `JobsCreationFailed`: When the TrainJob controller succeeded to construct objects, but it failed to deploy objects to the cluster.
+
 Additionally, we extend the [runtime framework interfaces](../../../pkg/runtime.v2/framework/interface.go)
 to allow each plugin to propagate the arbitrary conditions to the TrainJob.