[skip ci]Add comments in chap03_index_service.md (#12053)

Signed-off-by: ruiyi.jiang <ruiyi.jiang@zilliz.com>
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ryjiang 2021-11-18 22:23:49 +08:00 committed by GitHub
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@ -9,6 +9,7 @@
```go
type IndexCoord interface {
Component
// TimeTickProvider is the interface all services implement
TimeTickProvider
// BuildIndex receives requests from RootCoordinator to build an index.