[w3c/editing] Remove duplicated plaintext-only (#195)

Also sorted them as their hierarchical order.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/editing/pull/195

-- Commit Summary --

  * add missing space
  * remove duplicated plaintext-only

-- File Changes --

    M contentEditable.html (15)

-- Patch Links --

https://github.com/w3c/editing/pull/195.patch
https://github.com/w3c/editing/pull/195.diff

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