Document new split functions

docs/scarpet/language/Containers.md

@@ -160,11 +160,19 @@ join('-', 'foo', 'bar')  => foo-bar
 Splits a string under `expr` by `delim` which can be a regular expression. If no delimiter is specified, it splits
 by characters.
 
+If `expr` is a list, it will split the list into multiple sublists by the element (s) which equal `delim`, or which equal the empty string
+in case no delimiter is specified.
+
+Splitting a `null` value will return an empty list.
+
 <pre>
 split('foo') => [f, o, o]
 split('','foo')  => [f, o, o]
 split('.','foo.bar')  => []
 split('\\.','foo.bar')  => [foo, bar]
+split(1,[2,5,1,2,3,1,5,6]) => [[2,5],[2,3],[5,6]]
+split(1,[1,2,3,1,4,5,1] => [[], [2,3], [4,5], []]
+split(null) => []
 </pre>
 
 ### `slice(expr, from, to?)`