GApplication: Fix required # of elements in docs
GApplication: Fix required # of elements in docs

The reality, as shown by our tests, is that only 2 elements are needed.

endlessm/glib,johne53/MB3Glib,johne53/MB3Glib,endlessm/glib,johne53/MB3Glib,endlessm/glib,endlessm/glib,endlessm/glib,johne53/MB3Glib,johne53/MB3Glib,johne53/MB3Glib