[w3c/editing] Add subscript command to overview, fixes #288 (#290)

Closes #288

This is just a minor correction for an error that likely was caused by a conversion of the document from an older format.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/editing/pull/290

-- Commit Summary --

  * Add subscript command to overview, fixes #288

-- File Changes --

    M docs/execCommand/index.html (2)

-- Patch Links --

https://github.com/w3c/editing/pull/290.patch
https://github.com/w3c/editing/pull/290.diff

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https://github.com/w3c/editing/pull/290