Add actual priority values for built-in PriorityClasses to documentation

This is a Feature Request

What would you like to be added

Add the actual priority values for the built-in PriorityClasses (system-cluster-critical and system-node-critical) to the Pod Priority and Preemption page.

Why is this needed?

The current documentation mentions these built-in PriorityClasses but doesn't specify their actual priority values:

• system-node-critical: 2000001000
• system-cluster-critical: 2000000000

Users can see these values by running kubectl get priorityclasses, but having them in the documentation would provide better context when choosing right priority values for custom PriorityClasses.

If this is valuable, /assign