Remove cocurrenty-state-endpoint from docs

[mgencur]

This configuration element was removed as part of https://github.com/knative/serving/pull/13830

"Fixes #issue-number" or "Add description of the problem this PR solves"

Proposed Changes

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[skonto]

/lgtm /approve

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mgencur, skonto

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