[w3c/IndexedDB] Editorial: Fix some incorrect capitalization, and make sections less shouty (#320)

Non-normative.

* Fix a couple incorrect capitalization instances
* Make section titles consistently "Sentence case" instead of "Title Case"

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/IndexedDB/pull/320

-- Commit Summary --

  * Case fixes
  * less shouty

-- File Changes --

    M index.bs (46)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/320.patch
https://github.com/w3c/IndexedDB/pull/320.diff

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