Example of list representation

Clarifying additional example of JS list representation

Author: bwestergard

site/docsource/Runtime-representation.adoc

@@ -72,6 +72,7 @@ For example:
 
 * `[]` -> `0`
 * `x::y` -> `[x,y]`
+* `1::2::[3]` -> `[ 1, [ 2, [ 3, 0 ] ] ]`
 | Variant | *internal*
 
 | Polymorphic variant | *internal*