Fix typo.

whatsnew.htm

@@ -141,7 +141,7 @@ issigtool --key-file="MyKey.ispublickey" verify "MyProg.dll"</pre>
     </ul>
   </li>
   <li>Pascal Scripting change: Added new <tt>GetSHA256OfStream</tt> support function.</li>
-  <li>All translations which still had a UTF-8 BOM had their BOM removed. Using a BOM in UTF-8 encoded files is not needed and not recommended since Inno Stup 6.3.0.</li>
+  <li>All translations which still had a UTF-8 BOM had their BOM removed. Using a BOM in UTF-8 encoded files is not needed and not recommended since Inno Setup 6.3.0.</li>
   <li>Documentation improvements.</li>
   <li>Minor tweaks.</li>
 </ul>