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[skip ci] Fix grammar (#13310)

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Signed-off-by: Bennu <yunmei.li@zilliz.com>
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docs/design_docs/root_coordinator_recovery_on_power_failure.md
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@ -52,7 +52,7 @@
### 2.5 Flushed segment from `data node`
1. Each time the `data node` finishes flushing a segment, it sends the segment id to the `RC` via msgstream.
2. `RC` needs to fetch binlog from `DC` by id and send a request to `IC` to create index on this segment.
2. `RC` needs to fetch binlog from `DC` by id and send a request to `IC` to create an index on this segment.
3. When the `IC` is called successfully, it will return a build id, and then `RC` will update the build id to the `collection meta` and record the position of the msgstream in etcd.
4. Step 3 is transactional and the operation will be successful only if the `collection meta` in etcd is updated.
5. So the `RC` only needs to restore the msgstream to the position when recovering from a power failure.