message: docs/update-strategy: make airlock a link
diff: @@ -55,6 +55,7 @@ The `fleet_lock` strategy is a conservative method which is biased towards avoid
  Such an approach is only recommended where nodes are already grouped into an orchestrated cluster, which can thus provide better overall scheduling decisions.
  [fleet_lock]: https://github.com/coreos/airlock/pull/1
  +[airlock]: https://github.com/coreos/airlock
  [etcd3]: https://etcd.io/
  # Periodic strategy
  