[w3c/webcomponents] Update HTML Modules explainer phrasing around allowed element types (#878)

I modified 

> `<script>` elements of `type="module"` (non-module scripts will cause HTML Module creation to fail)

to 

> `<script>` elements of `type="module"` (non-module scripts will cause HTML Module creation to fail) and `<template>` elements

Is this correct? It seems to be what the explainer hints at. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webcomponents/pull/878

-- Commit Summary --

  * Update HTML Modules explainer phrasing around allowed element types

-- File Changes --

    M proposals/html-modules-explainer.md (2)

-- Patch Links --

https://github.com/w3c/webcomponents/pull/878.patch
https://github.com/w3c/webcomponents/pull/878.diff

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