Fix broken HTML tag

Author: InfinityGhost

OpenTabletDriver.Web/Views/Wiki/Install/Windows.cshtml

@@ -81,5 +81,5 @@
     <p>
     <small class="text-muted">
         Note: Only install WinUSB if your tablet requires it and <b>only</b> on the interface stated.
-    </p>
+    </small>
 </div>