DMN15 — Lists and filters section does not provide a dot accessor "." example with null

The current para (below) does not provide an example with null which could lead to misinterpretations.

For convenience, a selection using the "." operator with a list of contexts on its left hand side returns a list of
selections, i.e. FEEL(e.f, c) = [ FEEL(f, c'), FEEL(f, c"), ... ] where FEEL(e) = [ e', e", ... ] and c' is c augmented with
the context entries of e', c" is c augmented with the context entries of e", etc. For example,

[ {x:1, y:2}, {x:2, y:3} ].y = [2,3]

Add an example using null to the Lists and filters section

In section 10.3.2.5 add an example