[KEP-4671]: fix api version issue and update api with implementation

[kannon92]

• One-line PR description: Fix typos in KEP and update with latest api

• Issue link: Gang Scheduling Support in Kubernetes #4671

• Other comments:

I was testing this feature for 1.35. I wanted to learn more about it.

I had to tweak the examples a bit to get this to work.

apiVersion: scheduling.k8s.io/v1alpha1   
kind: Workload
metadata:
  namespace: default
  name: job-1
spec:
  podGroups:
    - name: "pg1"
      policy:
        gang:
          minCount: 50

An example job:

apiVersion: batch/v1
kind: Job
metadata:
  name: sleep-job
spec:
  parallelism: 200
  completions: 200
  template:
    spec:
      workloadRef:
        name: job-1
        podGroup: pg1
      containers:
      - name: sleep-container
        image: busybox:latest
        command: ["sleep", "10000"]
        resources:
          requests:
            cpu: 100m
            memory: 100Mi
          limits:
            cpu: 100m
            memory: 100Mi
      restartPolicy: Never
  backoffLimit: 4

[kannon92]

cc @wojtek-t @helayoty @erictune

[macsko]

Fix the pod spec below as well:

apiVersion: v1
kind: Pod
metadata:
  name: jobset-job-1-abc123
spec:
  ...
  workloadKey:
    name: jobset
    podGroup: job-1
    podGroupReplicaKey: key-2
  ...

[kannon92]

done.

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[wojtek-t]

Should be workloadRef

[macsko]

You can also replace all spec.workload occurrences in the KEP to spec.workloadRef