Good question. First a straightforward answer. Cons does not exist as a library function for constructing lists (it is rather a part of the reified types API meaning something different).
We write this:
rascal>[1, *[2,3,4]]
list[int]: [1,2,3,4]
rascal>1 + [2,3,4]
list[int]: [1,2,3,4]
rascal>[1] + [2,3,4]
list[int]: [1,2,3,4]
rascal>list[int] myList(int i) = [0..i];
list[int] (int): list[int] myList(int);
rascal>[*myList(10), *myList(20)]
list[int]: [0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]
Now an explanation for the confusion. The Rascalopedia course is on abstract concepts and terms typically good to know when working with Rascal. This may be too basic for you. I would focus on the Rascal language and libraries course for more concrete examples and information relevant to programming in Rascal. See http://tutor.rascal-mpl.org/Rascal/Expressions/Values/List/List.html for the list literals and http://tutor.rascal-mpl.org/Rascal/Libraries/Prelude/List/List.html for library functions on lists.
Some other list handiness, used for deconstructing as opposed to constructing:
rascal>[1,2,3,4][1..]
list[int]: [2,3,4]
rascal>[1,2,3,4][1..2]
list[int]: [2]
rascal>[1,2,3,4][..-1]
list[int]: [1,2,3]
rascal>if ([*x, *y] := [1,2,3,4], size(x) == size(y)) println(<x,y>);
<[1,2],[3,4]>
ok
rascal>for ([*x, *y] := [1,2,3,4]) println(<x,y>);
<[],[1,2,3,4]>
<[1],[2,3,4]>
<[1,2],[3,4]>
<[1,2,3],[4]>
<[1,2,3,4],[]>