Added limitations in 'Managing Common Dependencies with Parent Services' with a caution

Author: venu

components/dependency_injection/parentservices.rst

@@ -273,6 +273,10 @@ when the child services are instantiated.
    is that omitting the ``parent`` config key will mean that the ``calls``
    defined on the ``mail_manager`` service will not be executed when the
    child services are instantiated.
+   
+.. caution::
+
+   ``scope``, ``abstract``, ``abstract`` attributes are always taken from the child.
 
 The parent service is abstract as it should not be directly retrieved from the
 container or passed into another service. It exists merely as a "template" that