Minor changes on Section 9.5

Align the summary with the proposed changes:

from "Represents a point of access where application services are made available to a user, another application component, or a node." to "Represents a point of access where application services offered by an application internal active structure element can be accessed.
from "Represents automated behavior that can be performed by an application component." to "Represents automated behavior that can be performed by an application internal active structure element."
from "Represents an explicitly defined exposed application behavior." to "An application service represents an explicitly defined behavior that an application internal structure element exposes to its environment."
from "Represents an application state change." to "An application event represents something that happens or occurs with the application, especially something significant or noteworthy, such as an application state change or an execution error."
change the ordering of behavior elements: process, function, interaction, service, event to align with the order of the sections