[w3c/webcomponents] Update Imperative-Shadow-DOM-Distribution-API.md (#761)

Add some example.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webcomponents/pull/761

-- Commit Summary --

  * wip
  * wip

-- File Changes --

    M proposals/Imperative-Shadow-DOM-Distribution-API.md (14)

-- Patch Links --

https://github.com/w3c/webcomponents/pull/761.patch
https://github.com/w3c/webcomponents/pull/761.diff

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