[w3c/IndexedDB] Clarify usage of SharedArrayBuffer as key (Issue #506)

evanstade created an issue (w3c/IndexedDB#506)

The spec [says](https://www.w3.org/TR/IndexedDB/#convert-a-value-to-a-key) a "buffer source type" can be a key. That [includes](https://webidl.spec.whatwg.org/#buffer-types) `ArrayBuffer` and `SharedArrayBuffer`. There is also [non-normative text](https://www.w3.org/TR/IndexedDB/#key-construct) in the IDB spec that makes it seem like only `ArrayBuffer` would be allowed.

This was [recently fixed in Chromium](https://chromium-review.googlesource.com/c/chromium/src/+/8393497).

This was [recently disallowed in Firefox](https://github.com/mozilla-firefox/firefox/commit/4b248a1b1aae3fe9e7449ab8bbb2e49393948647).

I don't really see much purpose in allowing SAB, and it seems most likely that few to no legitimate sites use SAB as a key (since it didn't work before), and I've never heard it being requested either.

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