Update for-loops.md--move nit from code to output

nit is included at the end of this loop when it should be the output, so I removed it from the code and made it the output.

Author: scottcpeterson

episodes/for-loops.md

@@ -198,9 +198,10 @@ result = ""
 for char in original:
    result = char + result
 print(result)
+```
+```output
 nit
 ```
-
 If you were to expand out the loop the iterations would look something like this:
 
 ```python