[w3c/selection-api] Link editing host to html definition (#119)

Hi! I recently [imported](https://github.com/whatwg/html/pull/5253/) the definition of `editing host` from the execCommand spec to the HTML spec.

@marcoscaceres mentioned that the next steps are to find other specs that currently use `editing host` and to do the following:
1. remove any redefinitions
2. link the singular and plural forms of `editing host` to the [current definition in the HTML spec](https://html.spec.whatwg.org/multipage/interaction.html#editing-host).

In this PR, I have :
1. removed a redefinition of `editing host` in `index.html`.
2. linked `editing host` to the current definition in the HTML spec.

Similar PRs related to the `editing host` import:
* [PR 109 - Clipboard APIs](https://github.com/w3c/clipboard-apis/pull/109)
* [PR 108 - Input Events](https://github.com/w3c/input-events/pull/108)

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

  https://github.com/w3c/selection-api/pull/119

-- Commit Summary --

  * remove redefinition of editing host
  * link mentions of `editing host` to its definition in html spec
  * tidy spec

-- File Changes --

    M index.html (9)

-- Patch Links --

https://github.com/w3c/selection-api/pull/119.patch
https://github.com/w3c/selection-api/pull/119.diff

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/w3c/selection-api/pull/119