[w3c/IndexedDB] deleteDatabase() developer note says result is null; the method steps set it to undefined (Issue #507)

RizgarOzan created an issue (w3c/IndexedDB#507)

The "For web developers" box for `deleteDatabase()` says:

> If the request is successful request's result will be null.

But the `deleteDatabase(name)` method steps set it to undefined:

> Otherwise, set request's result to undefined, set request's done flag to true, and fire a version change event named success ...

The steps have said undefined since #202 (2017), and that's what engines return: in Chromium (Edge 153), `indexedDB.deleteDatabase("x")` fires `success` with `request.result === undefined`. WebKit and Gecko also leave the result undefined on success.

Suggested fix: change "will be null" to "will be undefined" in the domintro box.

Came up in mdn/content#45719, which fixes the same thing on MDN's `deleteDatabase()` page.


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