Fix reference to other chapter (in 5.6. The @New qualifier)

http://docs.jboss.org/weld/reference/latest/en-US/html_single/#d0e2044

At the end of "5.6. The @New qualifier", there's:

This feature is particularly useful with producer methods, as we'll see in the next chapter.

The next chapter is about something else.
The referenced chapter is:

III. Loose coupling with strong typing
8. Producer methods