small fixes

vala/live.gnome.org_tutorial/main_loop.vala

@@ -11,6 +11,9 @@ void main() {
 
     time.attach(loop.get_context());
 
-    loop.run();
-}
+    stdout.puts ("Call MainLoop.run ():\n");
 
+    loop.run(); // blocking method
+
+    stdout.puts ("End of main().\n");
+}