[w3c/clipboard-apis] Editorial: Remove redefinition of `editing host`. Link mentions of it to its HTML spec definition (#109)

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` that links to https://github.com/whatwg/html/pull/5253/
2. linked `editing host` to the current definition in the HTML spec.

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

  https://github.com/w3c/clipboard-apis/pull/109

-- Commit Summary --

  * link to html definition of `editing host`
  * remove redefinition of `editing host`

-- File Changes --

    M index.html (2)
    M tests.html (6)

-- Patch Links --

https://github.com/w3c/clipboard-apis/pull/109.patch
https://github.com/w3c/clipboard-apis/pull/109.diff

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