[w3c/editing] Add a link to the EditContext Spec (PR #364)

I browsed around, but didn't find a way to go from our repo to the public facing spec text. Therefore this. But maybe there is a link that I just didn't see?
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/editing/pull/364

-- Commit Summary --

  * Add a link to the EditContext Spec

-- File Changes --

    M docs/EditContext/README.md (2)

-- Patch Links --

https://github.com/w3c/editing/pull/364.patch
https://github.com/w3c/editing/pull/364.diff

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