Update arrow scroll copy in settings

assets/javascripts/templates/pages/settings_tmpl.coffee

@@ -54,7 +54,7 @@ app.templates.settingsPage = (settings) -> """
       </label>
       <label class="_settings-label">
         <input type="checkbox" form="settings" name="arrowScroll" value="1"#{if settings.arrowScroll then ' checked' else ''}>Use arrow keys to scroll the main content area
-        <small>With this checked, use <code class="_label">alt</code> + <code class="_label">&uarr;</code><code class="_label">&darr;</code><code class="_label">&larr;</code><code class="_label">&rarr;</code> to navigate the sidebar.</small>
+        <small>With this checked, use <code class="_label">shift</code> + <code class="_label">&uarr;</code><code class="_label">&darr;</code><code class="_label">&larr;</code><code class="_label">&rarr;</code> to navigate the sidebar.</small>
       </label>
     </div>
   </div>