GIGA AREF info [HC-1521] (arduino#357)

* added giga in the table

* Apply suggestions from code review

Co-authored-by: seaxwi <71350948+seaxwi@users.noreply.github.com>

---------

Co-authored-by: seaxwi <71350948+seaxwi@users.noreply.github.com>

Author: gorillagripcore

content/Hardware Support/Generic/About-the-AREF-pin.md

@@ -26,6 +26,16 @@ Not all boards have an enabled AREF pin, and it doesn't work the same way on all
       <blockquote><b>Note:</b> To avoid damaging your board, read the library reference's <a href="https://www.arduino.cc/reference/en/language/functions/analog-io/analogreference/#_notes_and_warnings">notes and warnings</a> section before using an external reference voltage.</blockquote>
     </td>
   </tr>
+  <tr>
+    <td>
+      <ul>
+        <li>Arduino GIGA R1</li>
+      </ul>
+    </td>
+    <td>
+        Any external voltage applied to the AREF pin will be automatically used as the reference.
+    </td>
+  </tr>
   <tr>
     <td>
       <ul>