[skip ci]Change etcd to lowercase (#9983)

Signed-off-by: Weida Zhu <weida.zhu@zilliz.com>
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zwd1208 2021-10-15 18:58:37 +08:00 committed by GitHub
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@ -4,7 +4,7 @@ Data cooridnator(datacoord for short) is the component to organize DataNodes and
## Dependency
- KV store: a kv store has all the meta info datacoord needs to operate. (ETCD)
- KV store: a kv store has all the meta info datacoord needs to operate. (etcd)
- Message stream: a message stream to communicate statistics information with data nodes. (Pulsar)
- Root Coordinator: timestamp, id and meta source.
- Data Node(s): could be an instance or a cluster, actual worker group handles data modification operations.