[w3c/webcomponents] Update HTML modules explainer with link to duplicate exports issue (#833)

See issue thread here: https://github.com/w3c/webcomponents/issues/831
I didn't want to bog down the explainer with all the details in that thread, but thought it would be helpful to include a more generally clarifying paragraph with a link to an example.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webcomponents/pull/833

-- Commit Summary --

  * Update HTML modules explainer with link to duplicate exports issue

-- File Changes --

    M proposals/html-modules-explainer.md (6)

-- Patch Links --

https://github.com/w3c/webcomponents/pull/833.patch
https://github.com/w3c/webcomponents/pull/833.diff

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https://github.com/w3c/webcomponents/pull/833