minor changes to the drools documentation

In the documentation [ver 4.0.0]
[not using the numbering because latest version -> different numbering]
===================
chapter :
The rule language
-> Rule
-->Left Hand Side Conditional Elements
->operators
misspelled operator : in the documentation memberof is used, whilst in drools memberOf should be used [case thingie]

====================
chapter :
The rule language
-> Rule
-->Left Hand Side Conditional Elements
->> forall

example : combining forall with Not CE
in own testing the not forall like used in the example doesnt seem to work
when adding parenthesis the problem is resolved
i.e.
when
not ( <- add this one
forall (things_here)
) <- add this one