Updated smnp.collection (markdown)

smnp.collection.md

@@ -67,6 +67,16 @@ println(x);
 # C4:(1/4) :: D4:(1/4) :: 14 :: 3.14 :: true
 ```
 
+## `list.sublist(beginIndex: int, endIndex: int)`
+Returns a sublist.
+
+### Example
+```
+x = ["a", "b", "c", "d", "e", "f", "g", "h"];
+
+println(x.sublist(3, 6));    # [d, e, f]
+```
+
 ## `list.isEmpty()`
 Checks if list doesn't contain any element.