set KEP status to implemented

Signed-off-by: Itamar Holder <iholder@redhat.com>

Author: iholder101

keps/sig-node/2400-node-swap/kep.yaml

@@ -10,7 +10,7 @@ authors:
 owning-sig: sig-node
 participating-sigs:
   - sig-node
-status: implementable
+status: implemented
 creation-date: 2021-04-06
 reviewers:
   - "@anguslees"