[skip ci] Add note for design doc (#13134)

Signed-off-by: yhmo <yihua.mo@zilliz.com>
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groot 2021-12-10 10:31:20 +08:00 committed by GitHub
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@ -6,7 +6,7 @@ update: 6.21.2021, by [Goose](https://github.com/XuanYang-cn)
## What's DataNode?
DataNode processes insert data and persist them.
DataNode processes insert data and persist insert data into storage.
DataNode is based on flowgraph; each flowgraph cares about only one vchannel. There are data definition language (DDL) messages, data manipulation language (DML)
messages, and timetick messages inside one vchannel, FIFO log stream.