Docs: styled stub warning

docs/user-guide/shortcuts.liquid

@@ -6,6 +6,11 @@ order: 900
 
 <p>You can use the following shortcuts to manage hosts and connections.</p>
 
+<p>
+  <a href="javascript:window.print()">Print this page</a> if you would like to
+  mount it on your wall for quick reference!
+</p>
+
 {% for item in shortcuts %}
   <h2>{{ item[0] }}</h2>
   {% render "shortcuts", shortcuts: item[1] %}