Update hardware_hookup.md

Adjust colors to match wire color since it is hard to see connection from zooming in

Author: bboyho

docs/hardware_hookup.md

@@ -125,21 +125,21 @@ You will then need to connect power and the UART pins between the boards. Below
             </td>
         </tr>
         <tr>        
-            <td style="text-align: center; border: solid 1px #cccccc;" bgcolor="#d4edda"><font color="#000000">UART2_TX (D17)</font>
+            <td style="text-align: center; border: solid 1px #cccccc;" bgcolor="#fff3cd"><font color="#000000">UART2_TX (D17)</font>
             </td>
-            <td style="text-align: center; border: solid 1px #cccccc;" bgcolor="#d4edda"><font color="#000000">RX</font>
+            <td style="text-align: center; border: solid 1px #cccccc;" bgcolor="#fff3cd"><font color="#000000">RX</font>
             </td>
         </tr>
         <tr>        
-            <td style="text-align: center; border: solid 1px #cccccc;" bgcolor="#ffdaaf"><font color="#000000">UART2_RX (D16)</font>
+            <td style="text-align: center; border: solid 1px #cccccc;" bgcolor="#cce5ff"><font color="#000000">UART2_RX (D16)</font>
             </td>
-            <td style="text-align: center; border: solid 1px #cccccc;" bgcolor="#ffdaaf"><font color="#000000">TX</font>
+            <td style="text-align: center; border: solid 1px #cccccc;" bgcolor="#cce5ff"><font color="#000000">TX</font>
             </td>
         </tr>
         <tr>
-            <td style="text-align: center; border: solid 1px #cccccc;" bgcolor="#DDDDDD"><font color="#000000">GND</font>
+            <td style="text-align: center; border: solid 1px #cccccc;" bgcolor="#d4edda"><font color="#000000">GND</font>
             </td>
-            <td style="text-align: center; border: solid 1px #cccccc;" bgcolor="#DDDDDD"><font color="#000000">GND</font>
+            <td style="text-align: center; border: solid 1px #cccccc;" bgcolor="#d4edda"><font color="#000000">GND</font>
             </td>
         </tr>
     </table>