[Polymer] Roll polymer to latest version

third_party/polymer/v1_0/components-chromium/paper-menu/README.md

 
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     </paper-menu>
 
 An initial selection can be specified with the `selected` attribute.
 
     <paper-menu selected="0">
       <paper-item>Item 1</paper-item>
       <paper-item>Item 2</paper-item>
     </paper-menu>
 
 Make a multi-select menu with the `multi` attribute. Items in a multi-select menu can be deselected,
-and multiple item can be selected.
+and multiple items can be selected.
 
     <paper-menu multi>
       <paper-item>Item 1</paper-item>
       <paper-item>Item 2</paper-item>
     </paper-menu>
 
 ### Styling
 
 The following custom properties and mixins are available for styling:
 
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         </paper-menu>
       </paper-submenu>
     </paper-menu>
 
 Just like in `<paper-menu>`, the focused item is highlighted, and the selected
 item has bolded text. Please see the `<paper-menu>` docs for which attributes
 (such as `multi` and `selected`), and styling options are available for the
 `menu-content` menu.