[skip ci] Fix golint error in querynode (#9289)

Signed-off-by: zhenshan.cao <zhenshan.cao@zilliz.com>

internal/querynode/load_index_info.go

@@ -30,6 +30,7 @@ import (
 	"github.com/milvus-io/milvus/internal/log"
 )
 
+// LoadIndexInfo is a wrapper of the underlying C-structure C.CLoadIndexInfo
 type LoadIndexInfo struct {
 	cLoadIndexInfo C.CLoadIndexInfo
 }