[w3c/webcomponents] Update attachedCallback to connectedCallback. (#491)

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webcomponents/pull/491

-- Commit Summary --

  * Update attachedCallback to connectedCallback.

-- File Changes --

    M spec/custom/index.html (2)

-- Patch Links --

https://github.com/w3c/webcomponents/pull/491.patch
https://github.com/w3c/webcomponents/pull/491.diff

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