porting \n on board dir

PORTING.md

@@ -18,7 +18,7 @@ These instructions are seperated into 3 big steps:
      If you feel too uncreative, you can skip it,<br />
       but your board will not be supported, till I have the time to make the pinout.<br />
     <br />
-    For the pintab.py, you need to properly add all the user accessible pins of the board module.
+    For the pintab.py, you need to properly add all the user accessible pins of the board module.<br />
      <code>import board;dir(board)</code><br />
      Make sure not to add duplicate pins, or the board.LED.<br />
     <br />