[w3c/gamepad] Clarifications for getGamepads (#72)

a) Why, in the example, is there a leading 'null'?  Is it indicating
there are two gamepads but not giving you information about the first
one? Why?

b) "Gamepads MUST only appear in the list if they are currently
connected to the user agent, and at least one device has been
interacted with by the user." - that's great. But what does
"interacted with by the user" mean? Ever since process start? For this
origin?

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