gobject docs: Remove confusing acronym

In the wikipedia disambiguation page[1] the only entry that even
remotely makes sense in this context is "and so on". Google searches
for "aso memory management" and "aso garbage collection" don't yield
anything relevant.

[1] http://en.wikipedia.org/wiki/ASO

https://bugzilla.gnome.org/show_bug.cgi?id=679996

docs/reference/gobject/tut_gobject.xml

@@ -264,7 +264,7 @@ MamanBar *bar = g_object_new (MAMAN_TYPE_BAR, NULL);
       The memory-management API for GObjects is a bit complicated but the idea behind it
       is pretty simple: the goal is to provide a flexible model based on reference counting
       which can be integrated in applications which use or require different memory management
-      models (such as garbage collection, aso...). The methods which are used to
+      models (such as garbage collection). The methods which are used to
       manipulate this reference count are described below.
 <programlisting>
 /*