patch applied (ghc): Fixed error in user' s manual, gadt section, part about deriving. Data constructor type was Maybe, should be Maybe1.

[d00bring at dtek.chalmers.se]

Fri Sep 15 16:05:17 PDT 2006  bringert at cs.chalmers.se
  * Fixed error in user's manual, gadt section, part about deriving. Data constructor type was Maybe, should be Maybe1.

    M ./docs/users_guide/glasgow_exts.xml -2 +2