Fix typo to make the Iterator section's exercise 8 editable in the browser

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Fix typo to make the Iterator section's exercise 8 editable in the browser #528

Open mckzm opened 4 months ago

mckzm commented 4 months ago

The Iterator section's 8th exercise is currently uneditable in the browser owing to a small typo in its source, which has edtiable instead of the correct editable. This PR fixes the typo to make the code editable.