[skip ci]Update comments for connection tests (#9080)

Signed-off-by: Nyanliang567 <yanliang.qiao@zilliz.com>

tests/python_client/testcases/test_connection.py

@@ -395,9 +395,10 @@ class TestConnectionOperation(TestcaseBase):
     @pytest.mark.tags(ct.CaseLabel.L1)
     def test_connection_connect_default_alias_invalid(self, port):
         """
-        target: connect passes configure is not exist and raise error
-        method: connect passes configure is not exist
-        expected: response of connect is error
+        target: connect with non existing params
+        method: 1. add connection with non existing params
+                2. try to connect
+        expected: raise an exception
         """
 
         # add invalid default connection