Minor changes in Section 5.2.2

Minor changes to improve readability:

From "The access relationship indicates that a process, function, interaction, service, or event “does something” with a passive structure element;" to "The access relationship indicates that a behavior or active structure element “does something” with a passive structure element"

From "The relationship can also be used to indicate that the object is just associated with the behavior" to " The relationship can also be used to indicate that the object is just associated with the behavior or active structure element"