Update P2D platform to Flint

Author: matejdro

source/_includes/hardware-platforms.html

@@ -38,7 +38,7 @@
             <td>Basalt</td>
             <td>Chalk</td>
             <td>Diorite</td>
-            <td>TBD</td>
+            <td>Flint</td>
             <td>TBD</td>
         </tr>
         <tr>
@@ -211,4 +211,4 @@
             diving.</li>
         <br>
     </ul>
-</div>
+</div>