Fix typos in juju's metadata.yaml

cluster/juju/layers/kubernetes/metadata.yaml

@@ -4,8 +4,8 @@ maintainers:
     - Matthew Bruzek <matthew.bruzek@canonical.com>
     - Charles Butler <charles.butler@canonical.com>
 description: |
-  Kubernetes is an open-source platform for deplying, scaling, and operations
-  of appliation containers across a cluster of hosts. Kubernetes is portable
+  Kubernetes is an open-source platform for deploying, scaling, and operations
+  of application containers across a cluster of hosts. Kubernetes is portable
   in that it works with public, private, and hybrid clouds. Extensible through
   a pluggable infrastructure. Self healing in that it will automatically
   restart and place containers on healthy nodes if a node ever goes away.