C++: Fix test expectation

Author: dave-bartolomeo

cpp/ql/test/query-tests/Likely Bugs/OO/NonVirtualDestructorInBaseClass/NonVirtualDestructorInBaseClass.expected

@@ -1,3 +1,3 @@
-| NonVirtualDestructorInBaseClass.cpp:56:8:56:34 | Base_Virtual_NonVirtualDtor | Base classes with a virtual function must define a virtual destructor. |
-| NonVirtualDestructorInBaseClass.cpp:68:8:68:48 | Base_Virtual_NonVirtualDtorWithDefinition | Base classes with a virtual function must define a virtual destructor. |
-| NonVirtualDestructorInBaseClass.cpp:78:8:78:54 | Base_Virtual_NonVirtualDtorWithInlineDefinition | Base classes with a virtual function must define a virtual destructor. |
+| NonVirtualDestructorInBaseClass.cpp:56:8:56:34 | Base_Virtual_NonVirtualDtor | A base class with a virtual function should define a virtual destructor. |
+| NonVirtualDestructorInBaseClass.cpp:68:8:68:48 | Base_Virtual_NonVirtualDtorWithDefinition | A base class with a virtual function should define a virtual destructor. |
+| NonVirtualDestructorInBaseClass.cpp:78:8:78:54 | Base_Virtual_NonVirtualDtorWithInlineDefinition | A base class with a virtual function should define a virtual destructor. |