update MacOS keyboard shortcut link

sections/menus/menus.html

@@ -32,7 +32,7 @@ <h2>ProTip</h2>
             <p>When designing an app for multiple operating systems it's important to be mindful of the ways application menu conventions differ on each operating system.</p>
             <p>For instance, on Windows, accelerators are set with an <code>&</code>. Naming conventions also vary, like between "Settings" or "Preferences". Below are resources for learning operating system specific standards.</p>
             <ul>
-              <li><a href="https://developer.apple.com/library/mac/documentation/UserExperience/Conceptual/OSXHIGuidelines/MenuBarMenus.html#//apple_ref/doc/uid/20000957-CH29-SW1">macOS<span class="u-visible-to-screen-reader">(opens in new window)</span></a></li>
+              <li><a href="https://developer.apple.com/macos/human-interface-guidelines/user-interaction/keyboard">macOS<span class="u-visible-to-screen-reader">(opens in new window)</span></a></li>
               <li><a href="https://msdn.microsoft.com/en-us/library/windows/desktop/bb226797(v=vs.85).aspx">Windows<span class="u-visible-to-screen-reader">(opens in new window)</span></a></li>
               <li><a href="https://developer.gnome.org/hig/stable/menu-bars.html.en">Linux<span class="u-visible-to-screen-reader">(opens in new window)</span></a></li>
             </ul>