[w3c/webcomponents] fix example so that attachShadow does not throw an exception (#632)

An unordered list `<ul>` is one of the elements that does not allow `attachShadow()` to be called. The example tries to call `attachShadow()` on the `<ul>`. This commit fixes this problem.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webcomponents/pull/632

-- Commit Summary --

  * fix example so that attachShadow does not throw an exception

-- File Changes --

    M spec/shadow/index.html (6)

-- Patch Links --

https://github.com/w3c/webcomponents/pull/632.patch
https://github.com/w3c/webcomponents/pull/632.diff

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https://github.com/w3c/webcomponents/pull/632