[w3c/webcomponents] Update Imperative-Shadow-DOM-Distribution-API.md (#866)

Updated based on the TPAC F2F meeting in Sept, 2019. https://github.com/whatwg/html/issues/3534#issuecomment-537802687
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webcomponents/pull/866

-- Commit Summary --

  * Update Imperative-Shadow-DOM-Distribution-API.md

-- File Changes --

    M proposals/Imperative-Shadow-DOM-Distribution-API.md (252)

-- Patch Links --

https://github.com/w3c/webcomponents/pull/866.patch
https://github.com/w3c/webcomponents/pull/866.diff

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