docs: current version is using `iteration` instead of `sprint`

[kashiwachen]

What's being changed (if available, include any code snippets, screenshots, or gifs):

Like I describe in this issue #20256. Current Project Page is using the word iteration other than sprint as the column, so the example from the doc doesn't work anymore

Closes #20256

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[cmwilson21]

@kashiwachen Thanks for opening a PR and issue. I'm editing your post slightly to link the two together.

I'll get this triaged for review! ⚡

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