intro-to-pd.md

@@ -146,11 +146,11 @@ Mary Had a Little Lamb
 
 Row Row Row Your Boat
 ======
-1  1  1 2 3 
-3  2 3  4 5   
-6 6 6 5 5 5 
-3 3 3 1 1 1
-5 4 3 2 1 
+1  1  1 2 3   
+3  2 3  4 5     
+6 6 6 5 5 5   
+3 3 3 1 1 1  
+5 4 3 2 1