Use list instead of code block to wrap module files example (ronreiter#688)

* Use list instead of code block to wrap module files example

* Use markdown syntax

Author: cycool29

Diff for: tutorials/learnpython.org/en/Modules and Packages.md

@@ -12,10 +12,13 @@ Modules in Python are simply Python files with a .py extension. The name of the
 A Python module can have a set of functions, classes or variables defined and implemented. 
 In the example above, we will have two files, we will have:
 
-    mygame/
-    mygame/game.py
-    mygame/draw.py
+- mygame/
+
+- mygame/game.py
+
+- mygame/draw.py
 
+ 
 The Python script `game.py` will implement the game. It will use the function `draw_game` from the file `draw.py`,
 or in other words, the`draw` module, that implements the logic for drawing the game on the screen.