[Docs] Remove unsupported Franca syntax elements
[Docs] Remove unsupported Franca syntax elements

* 'Array of' and 'Union' Franca types are currently not yet
  supported.

Change-Id: I9dddc0a5327c1f32976e2bea0580e5abdf183709

clive-jevons/joynr,bmwcarit/joynr,clive-jevons/joynr,bmwcarit/joynr,bmwcarit/joynr,clive-jevons/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,clive-jevons/joynr,bmwcarit/joynr,clive-jevons/joynr,clive-jevons/joynr