Fix documentation of FocusOptions.focusVisible. #34875
                
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Description
focusVisible: falseis not equivalent to not specifying the option as the current text implies.The spec is clear, and only indicates focus if focusVisible is true, or not specified and a browser-heuristic matches, see 1:
That condition doesn't match if the member is present and is
false:)Motivation
It's wrong. There seems to be confusion in issues like w3c/csswg-drafts#5885, partially due to the wrong MDN documentation.
Additional details
I wrote the spec (see whatwg/html#8087), and this was explicitly discussed in the WHATWG in the various meetings referenced from whatwg/html#7830 :)