[skip e2e]Add comments to conf adapter file (#14413)

Signed-off-by: Njingkl <jingjing.jia@zilliz.com>

internal/util/indexparamcheck/conf_adapter_test.go

@@ -293,6 +293,7 @@ func TestNSGConfAdapter_CheckTrain(t *testing.T) {
 	}
 }
 
+// HNSWConfAdapter checks if a hnsw index can be built.
 func TestHNSWConfAdapter_CheckTrain(t *testing.T) {
 	validParams := map[string]string{
 		DIM:            strconv.Itoa(128),