[TD-12145]<test> add test case for nest query for select key timestamp in some sense

tests/system-test/2-query/TD-12145.py

@@ -50,7 +50,7 @@ class TDTestCase:
 
         '''
         case1 <author>:wenzhouwww [TD-12145] : 
-            this test case is an test case for support  nest query to  select key timestamp col  in outer query ;
+            this test case is an test case for support  nest query to  select key timestamp col  in outer query .
         ''' 
         return