Update content for “Understand your pension type” article.

See: https://docs.google.com/a/digital.cabinet-office.gov.uk/document/d/1tm_RN6TxK6p9jiEdTyZnFG35-on5kICA0BYjcYypCt4/edit
Merge branch 'ggp-20141106-alpha' of github.com:guidance-guarantee-programme/prototypes into ggp-20141106-alpha