Add documentation about PrioritySortingWithinCohort feature

[yaroslava-serdiuk]

What type of PR is this?

/kind documentation

Which issue(s) this PR fixes:

Fixes #1283

Does this PR introduce a user-facing change?

None

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[yaroslava-serdiuk]

/assign @tenzen-y

[tenzen-y]

@yaroslava-serdiuk Can we also add the explanations for the PrioritySortingWithinCohort?

I believe that we can describe this feature in the https://github.com/kubernetes-sigs/kueue/blob/98ec37470b09a3e11baf3de1f1759500c8af32d9/site/content/en/docs/concepts/cluster_queue.md#cohort.

[yaroslava-serdiuk]

@tenzen-y added a note for the feature. I think it's enough, because the feature is a temporary (at some point we will graduate the feature, i.e. the feature is always enabled; you cannot disable it or deprecate the feature if we find another solution for workloads sorting).
cc @alculquicondor

[alculquicondor]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alculquicondor, yaroslava-serdiuk

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[k8s-ci-robot]

LGTM label has been added.

Git tree hash: e7396564dd7ef234e97a16baa129bc776e792e0f