[skip ci]Add notes to conf adapter (#12787)

Signed-off-by: zilliz <zilliz@zillizdeMacBook-Pro.local>

Co-authored-by: zilliz <zilliz@zillizdeMacBook-Pro.local>

internal/util/indexparamcheck/conf_adapter.go

@@ -138,6 +138,7 @@ func newBaseConfAdapter() *BaseConfAdapter {
 	return &BaseConfAdapter{}
 }
 
+// IVFConfAdapter checks if a IVF index can be built.
 type IVFConfAdapter struct {
 	BaseConfAdapter
 }