[whatwg/dom] Editorial: address assorted feedback (PR #1483)

In particular:

- Add a link to the get the parent issue.
- Stop saying "useless".
- Briefly explain attachShadow()'s safelist.

Fixes #702.

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

  https://github.com/whatwg/dom/pull/1483

-- Commit Summary --

  * Editorial: address assorted feedback

-- File Changes --

    M dom.bs (13)

-- Patch Links --

https://github.com/whatwg/dom/pull/1483.patch
https://github.com/whatwg/dom/pull/1483.diff

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