minor: added a reference to the documentation

bin/moa

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 #
 # Copyright 2009, 2010 Mark Fiers, Plant & Food Research
 #
@@ -18,7 +18,12 @@
 # along with Moa.  If not, see <http://www.gnu.org/licenses/>.
 #
 """
-Moa executable script
+Moa executable
+
+for more information, see:
+
+- http://moa.readthedocs.org/en/latest/index.html
+- https://github.com/mfiers/Moa
 
 """