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[skip ci] Check the grammar of root_coord_recovery docs (#12746)

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Signed-off-by: min.tian <min.tian.cn@gmail.com>
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docs/design_docs/root_coordinator_recovery_on_power_failure.md
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@ -33,7 +33,7 @@
### 2.3 `create index` requests from grpc ### 2.3 `create index` requests from grpc
1. In the processing of `create index`, `RC` calls `metaTable`'s `GetNotIndexedSegments` to get all segment ids that are not indexed 1. In the processing of `create index`, `RC` calls `metaTable`'s `GetNotIndexedSegments` to get all segment ids that are not indexed
2. After getting the segment ids, `RC` call `IC` to create index on these segment ids. 2. After getting the segment ids, `RC` calls `IC` to create index on these segment ids.
3. In the current implementation, the `create index` requests will return after the segment ids are put into a go channel. 3. In the current implementation, the `create index` requests will return after the segment ids are put into a go channel.
4. The `RC` starts a background task that keeps reading the segment ids from the go channel, and then calls the `IC` to create the index. 4. The `RC` starts a background task that keeps reading the segment ids from the go channel, and then calls the `IC` to create the index.
5. There is a fault here, the segment ids have been put into the go channel in the processing function of the grpc request, and then the grpc returns, but the `RC`'s background task has not yet read them from the go channel, then `RC` crashes. At this time, the client thinks that the index is created, but the `RC` does not call `IC` to create the index. 5. There is a fault here, the segment ids have been put into the go channel in the processing function of the grpc request, and then the grpc returns, but the `RC`'s background task has not yet read them from the go channel, then `RC` crashes. At this time, the client thinks that the index is created, but the `RC` does not call `IC` to create the index.