Incorrectly closed comment prevents icons from loading

[smerth]

In the file iron-iconset-svg.html the comment that begins on line 18

/**
   * The `iron-iconset-svg` element allows users to define their own icon sets

is incorrectly closed, this prevents icons from loading when this component is used.

the comment should be closed around line 52

   * @element iron-iconset-svg
   * @demo demo/index.html
   * @implements {Polymer.Iconset}
   **/