Update docs

docs/index.html

@@ -458,9 +458,9 @@ <h1>Delete account</h1>
 
             <div class="toolbar-warning">
                 <p>
-                    When nesting cards, you may include one button in the nested card.
+                    When nesting cards, you may include one layer of buttons in the nested card.
 
-                    The button must be extremely significant to merit this.
+                    The buttons must be extremely significant to merit this.
 
                     Downloading a copy of collected user data before deleting an account is important to some users and not directly related to other available actions, thus warranting the triple nesting.
                 </p>
@@ -906,4 +906,4 @@ <h3>Warning toolbar</h3>
 
     <script src="/utils.js"></script>
 </body>
-</html>
+</html>