etcd-website fix: moving how to migrate to v3.4

Signed-off-by: Wendy Ha <[email protected]>

Author: wendy-ha18

content/en/docs/v3.4/how-to-migrate.md

@@ -0,0 +1,30 @@
+---
+title: How to migrate etcd from v2 to v3
+description: etcd v2 to v3 migration guide
+weight: 1200
+---
+
+`migrate` to transform etcd v2 to v3 data format:
+
+![12_etcdctl_migrate_2016061602](https://storage.googleapis.com/etcd/demo/12_etcdctl_migrate_2016061602.gif)
+
+
+```shell
+# write key in etcd version 2 store
+export ETCDCTL_API=2
+etcdctl --endpoints=http://$ENDPOINT set foo bar
+
+# read key in etcd v2
+etcdctl --endpoints=$ENDPOINTS --output="json" get foo
+
+# stop etcd node to migrate, one by one
+
+# migrate v2 data
+export ETCDCTL_API=3
+etcdctl --endpoints=$ENDPOINT migrate --data-dir="default.etcd" --wal-dir="default.etcd/member/wal"
+
+# restart etcd node after migrate, one by one
+
+# confirm that the key got migrated
+etcdctl --endpoints=$ENDPOINTS get /foo
+```

content/en/docs/v3.6/tasks/operator/how-to-migrate.md

@@ -4,7 +4,7 @@ description: etcd v2 to v3 migration guide
 weight: 1200
 ---
 
-`migrate` to transform etcd v2 data model to v3 data model.
+`migrate` to transform etcd v2 data model to v3 data format.
 
 {{% alert color="warning" %}}
 ⚠️ **Deprecated functionality:**