Explain non-blocking event loops in the getting started example.

Author: HexDecimal

docs/tcod/getting-started.rst

@@ -45,6 +45,8 @@ Example::
                 console.print(x=0, y=0, string="Hello World!")
                 context.present(console)  # Show the console.
 
+                # This event loop will wait until at least one event is processed before exiting.
+                # For a non-blocking event loop replace `tcod.event.wait` with `tcod.event.get`.
                 for event in tcod.event.wait():
                     context.convert_event(event)  # Sets tile coordinates for mouse events.
                     print(event)  # Print event names and attributes.