CDI-430 Revise the description of container lifecycle ordering during application initialization

rewriting general lifecycle description and Bean Discovery detail.
In 11.5 summarized all event to stress the fact they're not presented in chronological order.
Break 12.4 in 3 subpart : filter, type discovery, bean discovery to be clearer.
Try to give a big picture of lifecycle in 12.2 and detail it 12.4.2 and 12.4.3.