[w3c/IndexedDB] Clarify purpose and lifetime of upgrade transactions (#155)

Per request by @cynthia over on https://github.com/w3c/IndexedDB/issues/154 - an attempt to clarify the role of upgrade transactions.

The previous "upgrade transactions" section was full of redundant non-normative text but not called out as such. Rework, remove some of the redundancy, and frame it with succinct snippets.

Hopefully this improved things: @cynthia - can you review?
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/IndexedDB/pull/155

-- Commit Summary --

  * WIP
  * Clarify upgrade transactions with non-normative note

-- File Changes --

    M index.bs (55)
    M index.html (793)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/155.patch
https://github.com/w3c/IndexedDB/pull/155.diff

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