[w3c/editing] Fix execCommand link (#245)

Since it's in ActiveDocuments directory.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/editing/pull/245

-- Commit Summary --

  * Fix execCommand link

-- File Changes --

    M README.md (12)

-- Patch Links --

https://github.com/w3c/editing/pull/245.patch
https://github.com/w3c/editing/pull/245.diff

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