[w3c/IndexedDB] Validate HTML (#219)

https://validator.w3.org/nu/?doc=https%3A%2F%2Fw3c.github.io%2FIndexedDB%2F :

> Element `details` is missing a required instance of child element `summary`.

I can adjust the text in the `summary` element if needed.

/cc @inexorabletash 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/IndexedDB/pull/219

-- Commit Summary --

  * Validate HTML

-- File Changes --

    M index.bs (13)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/219.patch
https://github.com/w3c/IndexedDB/pull/219.diff

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