PenBlocContainerExamples example broken

[StevenCostiou]

example3: BlRectangle instance DNU #border:

[nolwennfournier]

I do not know yet what kind of object can be used in description element to represent a vectorial shape. I will certainly create a "vectorial" object, or a Pharo object used like this.
So, the way used in this method (Bloc object) is not a good example...