Update policy_tuning wording to account for pipeline execution policies

What does this MR do and why?

Update policy_tuning wording to account for pipeline execution policies.

Depends on the rollout of [Feature flag] Rollout of `unblock_rules_using_... (#520982 - closed).

References

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• Documentation update: Update documentation of policy_tuning with pipe... (!183839 - merged)

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Before	After

Related to #498624 (closed)