Add CY15B104 documentation

gui/index.html

         <tr class=odd><td align=center>7</td><td>MOSI</td></tr>
         <tr class=odd><td align=center>12</td><td>MISO</td></tr>
         <tr class=odd><td align=center>14</td><td>SCK</td></tr>
+    </table>
+	</p>
+	<p>When <span class=literal>AUDIO_MEMORY_CY15B104</span> is used, a single
+		CY15B104 FRAM chip is used, with these pins:
+    <table class=doc align=center cellpadding=3>
+        <tr class=top><th>Pin</th><th>Signal</th></tr>
+        <tr class=odd><td align=center>6</td><td>CS</td></tr>
+        <tr class=odd><td align=center>7</td><td>SI</td></tr>
+        <tr class=odd><td align=center>12</td><td>SO</td></tr>
+        <tr class=odd><td align=center>14</td><td>SCK</td></tr>
     </table>
 	</p>
 	<p>When <span class=literal>AUDIO_MEMORY_MEMORYBOARD</span> is used, up to six