[w3c/uievents] Explain that mousedown focuses form controls (#81)

Refs https://html.spec.whatwg.org/#activation:dom-click-2

> Click-focusing behaviour (e.g. the focusing of a text field when user clicks in one) typically happens before the click, when the mouse button is first depressed, and is therefore not discussed here.

Nor is it discussed anywhere else in HTML. UI Events doesn't currently seem to cover this either, but I think it would be the logical place for it.

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