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[skip ci] Refine developer doc section number (#8617)

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Signed-off-by: Edward Zeng <jie.zeng@zilliz.com>
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docs/developer_guides/chap07_query_coordinator.md
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@ -1,14 +1,14 @@
## 8. Query Coordinator
## 7. Query Coordinator
#### 8.1 Overview
#### 7.1 Overview
<img src="./figs/query_coord.png" width=500>
#### 8.2 Query Coordinator Interface
#### 7.2 Query Coordinator Interface
```go
type QueryCoord interface {
@ -185,7 +185,7 @@ type GetSegmentInfoResponse struct {
}
```
#### 8.3 Query Channel
#### 7.3 Query Channel
* *SearchMsg*
@ -231,7 +231,7 @@ type RetriveMsg struct {
}
```
#### 8.4 Query Node Interface
#### 7.4 Query Node Interface
```go
type QueryNode interface {
@ -354,7 +354,7 @@ type GetSegmentInfoResponse struct {
//TODO
#### 8.2 Collection Replica
#### 7.5 Collection Replica
$collectionReplica$ contains a in-memory local copy of persistent collections. In common cases, the system has multiple query nodes. Data of a collection will be distributed across all the available query nodes, and each query node's $collectionReplica$ will maintain its own share (only part of the collection).
Every replica tracks a value called tSafe which is the maximum timestamp that the replica is up-to-date.