Trying to fix code indentation

cur/programming/python/object-oriented-programming-joshhug/ttt.html

@@ -51,6 +51,7 @@ <h2>Explanation of the Double For Loop List Comprehension</h2>
     <p>This can be equivalently expressed using two nested for loops:</p>
         <pre><code>
         board = []
+
         for _ in range(3):
             row = []
             for _ in range(3):