Fixed implementation history.

Author: jm-franc

keps/sig-autoscaling/4951-configurable-hpa-tolerance/README.md

@@ -819,7 +819,7 @@ Major milestones might include:
 - the version of Kubernetes where the KEP graduated to general availability
 - when the KEP was retired or superseded
 -->
-- 2024-11-XX Provisional KEP merged
+
 ## Drawbacks
 
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