pool: update the failure domain of pool-ec file to host

Updating the failure domain of pool-ec file from
osd to host.

Signed-off-by: subhamkrai <srai@redhat.com>

deploy/examples/pool-ec.yaml

@@ -10,7 +10,7 @@ metadata:
   namespace: rook-ceph # namespace:cluster
 spec:
   # The failure domain will spread the replicas of the data across different failure zones
-  failureDomain: osd
+  failureDomain: host
   # Make sure you have enough OSDs to support the replica size or sum of the erasure coding and data chunks.
   # This is the minimal example that requires only 3 OSDs.
   erasureCoded: