link to ScriptTask docu

docs/exercise1.rst

@@ -3,7 +3,8 @@ Exercise 1: Managing control flow
 
 With this exercise we will learn to describe the dependencies in control flow 
 between Fireworks, exploit possible concurrencies and use the built-in Firetask 
-``ScriptTask``.
+``ScriptTask``. The ``ScriptTask`` is fully documented here:
+https://materialsproject.github.io/fireworks/scripttask.html.
 
 Problem 1.1
 -----------