[w3c/webcomponents] Remove the reference attachedCallback in example (#487)

attachedCallback() is mentionend in the example TacoButton but
at the interface 2.4 CustomElementsRegistry the connectedCallback
replaces the attachedCallback.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webcomponents/pull/487

-- Commit Summary --

  * Remove the reference attachedCallback in example

-- File Changes --

    M spec/custom/index.html (2)

-- Patch Links --

https://github.com/w3c/webcomponents/pull/487.patch
https://github.com/w3c/webcomponents/pull/487.diff

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