docs: fix fireEvent Example code

[pppp606]

When I copied the code example, there was an error, so I fixed it.
https://testing-library.com/docs/preact-testing-library/api/#example-1

• Fix syntax error
• Delete undefined prop
  • https://developer.mozilla.org/en-US/docs/Web/API/Event/Event

[timdeschryver]

Thanks for the fix, though I would like to re-add the button property.

Suggested change

	cancelable: true,
	cancelable: true,
	button: 0

button is a valid event property - https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/button - and it's also implemented like this in fireEvent - https://github.com/testing-library/dom-testing-library/blob/main/src/event-map.js#L82.

[ph-fritsche]

@pppp606 is correct. There is no button property on Event. It is implemented on MouseEvent.
https://codesandbox.io/s/event-property-button-p6w8xh?file=/src/index.test.js

[pppp606]

@timdeschryver @ph-fritsche
Thanks to both of you. I have committed the suggestion, please recheck pr.

[timdeschryver]

@all-contributors please add @pppp606 for docs

[allcontributors]

@timdeschryver

I've put up a pull request to add @pppp606! 🎉