Missing cpu_entitlement in process stats description

[krismarc]

Issue

Not sure if it just needs to be added here:
https://github.com/cloudfoundry/cloud_controller_ng/blob/main/docs/v3/source/includes/resources/processes/_stats_object.md.erb

Similar action done here:
#4403
#4405

Context

No response

Steps to Reproduce

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Expected Result

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Current Result

No response

Possible Fix

No response