[whatwg/dom] Define "participate in a tree" instead of just "participate". (#216)

This makes linking from other specs simpler, since they have to mention
trees in the human-readable text anyway. For example, https://webbluetoothcg.github.io/web-bluetooth/#bluetooth-tree.

That said, it's not a big problem if you reject this.

Demo at https://rawgit.com/jyasskin/dom/participate-linking/dom.html#concept-tree-participate.

@tabatkins, the UI of a link inside another definition is bad: the click handler on the `<dfn>`that shows the dfnPanel prevents clicks on the `<a>` from working.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/216

-- Commit Summary --

  * Define "participate in a tree" instead of just "participate".

-- File Changes --

    M dom.bs (20)
    M dom.html (105)

-- Patch Links --

https://github.com/whatwg/dom/pull/216.patch
https://github.com/whatwg/dom/pull/216.diff

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