[skip ci] Check the grammar of index_design_md (#13025)

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@ -41,7 +41,7 @@ When the index task is marked as deleted, and the index status is complete, the
deleted from the MetaTable.
When IndexCoord receives a query index status request from other components, it will first check whether the corresponding
index task is marked for deletion in the MetaTable. If marked for deletion, it returns index does not exist, otherwise,
index task is marked for deletion in the MetaTable. If marked for deletion, it returns that index does not exist, otherwise,
it returns the index information.
## 8.3 Feature Design