[w3c/editing] Update README.md (#352)

Forgot that this page is visible via: https://w3c.github.io/editing/
so made the "this Repo" text into links to it :-)

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

  https://github.com/w3c/editing/pull/352

-- Commit Summary --

  * <a href="https://github.com/w3c/editing/pull/352/commits/6875d9775e5d89d8c7091afcca303f0032293f8d">Update README.md</a>

-- File Changes --

    M README.md (4)

-- Patch Links --

https://github.com/w3c/editing/pull/352.patch
https://github.com/w3c/editing/pull/352.diff

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