[w3c/IndexedDB] Upgrade transaction abort text (#186)

I believe this statement in reference to aborting an upgrade transaction:

> The steps are run after the normal steps to abort a transaction, which revert changes to the database including the set of associated object stores and indexes, as well as the change to the version.

should instead state (with changes in bold):

> The steps are run after the **first step of aborting** a transaction, which revert changes to the database including the set of associated object stores and indexes, as well as the change to the version.

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