docs: untracked_files is a property, but was used like a function, see http://groups.google.com/group/git-python/browse_thread/thread/84ed1835e26a5296?hl=en

Author: Byron

doc/tutorial.rst

@@ -31,7 +31,7 @@ Query the active branch, query untracked files or whether the repository data  h
     
     repo.is_dirty()
     False
-    repo.untracked_files()
+    repo.untracked_files
     ['my_untracked_file']
     
 Clone from existing repositories or initialize new empty ones::