website: Workload scheme is outdated in WorkloadPriorityClass cencept and Task page

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What happened:

The v1beta1 Workload schemes are used only for the priority related fields in the following pages:

• https://kueue.sigs.k8s.io/docs/concepts/workload_priority_class/#:~:text=priorityClassSource%3A%20kueue.x%2Dk8s.io/workloadpriorityclass%0A%20%20priorityClassName%3A%20sample%2Dpriority%0A%20%20priority%3A%2010000%0A%20%20queueName%3A%20user%2Dqueue
• https://kueue.sigs.k8s.io/docs/tasks/manage/run_job_with_workload_priority/#:~:text=priorityClassSource%3A%20kueue.x%2Dk8s.io/workloadpriorityclass%0A%20%20priorityClassName%3A%20sample%2Dpriority%0A%20%20priority%3A%2010000

What you expected to happen:
Those have v1beta2 schemas.

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• Kubernetes version (use kubectl version):
• Kueue version (use git describe --tags --dirty --always):
• Cloud provider or hardware configuration:
• OS (e.g: cat /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others:

[tenzen-y]

/kind documentation