[w3c/editing] Remove editing host definition and update references to it (#229)

Hi! 
As mentioned in this [HTML spec PR](https://github.com/whatwg/html/pull/5253/files), I am migrating the definition of some terms from the execCommand spec to the HTML spec. 

execCommand's definition of `editing host` has been [merged](https://github.com/whatwg/html/pull/5253/files) into the HTML spec. 

Following @marcoscaceres' [advice](https://github.com/whatwg/html/pull/5253#issuecomment-583948517), I am now removing the `editing host` definition from execCommand and updating execCommand's references to that definition.
We can now use Respec to [cite](https://respec.org/xref/?term=editing+host) `editing host` with `<a data-cite="html">editing host</a>`.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/editing/pull/229

-- Commit Summary --

  * remove definition of `editing host`
  * update references to `editing host`

-- File Changes --

    M execCommand.html (75)

-- Patch Links --

https://github.com/w3c/editing/pull/229.patch
https://github.com/w3c/editing/pull/229.diff

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