Update Polymer components.

third_party/polymer/components/paper-toast/paper-toast.html

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 <link rel="import" href="../polymer/polymer.html">
 <link rel="import" href="../iron-a11y-announcer/iron-a11y-announcer.html">
 <link rel="import" href="../iron-overlay-behavior/iron-overlay-behavior.html">
 
 <!--
-Material design: [Snackbards & toasts](https://www.google.com/design/spec/components/snackbars-toasts.html)
+Material design: [Snackbars & toasts](https://www.google.com/design/spec/components/snackbars-toasts.html)
 
 `paper-toast` provides a subtle notification toast. Only one `paper-toast` will
 be visible on screen.
 
 Use `opened` to show the toast:
 
 Example:
 
     <paper-toast text="Hello world!" opened></paper-toast>
 
@@ skipping 287 matching lines @@
         /**
          * Fired when `paper-toast` is opened.
          *
          * @event 'iron-announce'
          * @param {{text: string}} detail Contains text that will be announced.
          */
       });
     })();
   </script>
 </dom-module>