Update Sound Overview Information

hlp/sound_overview.htm

@@ -45,15 +45,16 @@
         <li><a href="vrc6.htm">Konami VRC6</a></li>
         <li><a href="vrc7.htm">Konami VRC7</a></li>
         <li><a href="fds.htm">Nintendo FDS</a></li>
-        <li><a href="n163.htm">Namco 163</a></li>
+        <li><a href="n163.htm">Namco 163</a></li>
         <li><a href="sunsoft.htm">Sunsoft 5B</a></li>
     </ul>
 
     <table class="noteFrame" cellpadding="5px"><tr><td>    
         <p class="text">
-            <b>Note</b>: External sound was 
-            not possible on the NES hardware, so songs containing external sound are not 
-            strictly NES sound. Expansion chips are also unsupported in PAL mode.
+            <b>Note</b>: External sound is not possible on the NES without hardware 
+            modification, so all songs using expansion chips should be treated as 
+            "Famicom Sound", and thus is not strictly "NES Sound". Additionally, all 
+            expansion chips cannot be run in PAL mode.
         </p>
     </td></tr></table>