typo in "cookbook/testing/widget/scrolling"

[John Kim]

https://docs.flutter.dev/cookbook/testing/widget/scrolling

trepeatedly => repeatedly

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Rather than assuming that you know the height of all the items in a list, or that a particular widget is rendered on all devices, the scrollUntilVisible() method trepeatedly scrolls through a list of items until it finds what it’s looking for.
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