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[skip ci] Fix grammar (#13144)

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Signed-off-by: Bennu <yunmei.li@zilliz.com>
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docs/developer_guides/chap01_system_overview.md
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@ -20,7 +20,7 @@ A batch insert/delete is guaranteed to become visible atomically.
<img src="./figs/data_organization.png" width=550>
In Milvus, 'collection' refers to the concept of a table. A collection can be optionally divided into several 'partitions'. Both collection and partition are the basic execution scopes of queries. When using the partition, users should know how a collection should be partitioned. In most cases, partition leads to more flexible data management and more efficient querying. For a partitioned collection, queries can be executed both on the collection or on a set of specified partitions.
In Milvus, 'collection' refers to the concept of a table. A collection can be optionally divided into several 'partitions'. Both collection and partition are the basic execution scopes of queries. When using the partition, users should know how a collection should be partitioned. In most cases, partition leads to more flexible data management and more efficient querying. For a partitioned collection, queries can be executed on the collection or a set of specified partitions.
Each collection or partition contains a set of 'segment groups'. The Segment group is the basic unit of data-to-node mapping. It's also the basic unit of a replica. For instance, if a query node failed, its segment groups will be redistributed across the other nodes. If a query node is overloaded, part of its segment groups will be migrated to underloaded ones. If a hot collection/partition is detected, its segment groups will be replicated to smooth the system load skewness.