Fix Python Introduction formatting

Author: methylDragon

Python 3/01 Python 3 - Introduction.md

@@ -1422,11 +1422,11 @@ Ever wondered how this works? Python implements this using Iterables and Iterato
   
   - ```python
     # Unlike lists, you can't do a for loop over this more than once
-  my_generator = (x * x for x in range(3))
-  
-    # Generators can only be iterated over ONCE. They do not store values in memory,
-    # but instead generate them on the fly
-  ```
+    my_generator = (x * x for x in range(3))
+    
+    # Generators can only be iterated over ONCE. 
+    # They do not store values in memory, but instead generate them on the fly
+    ```
   
 - **Iterators** are objects that define how the iteration is done! (Specifically, what the next item to be iterated is.)