The second time, the information was replaced with just this note: "Lets[sic] be fair, nobody cares about him."
Wikipedia is an online encyclopedia that anyone can edit -- which means vandalism sometimes happens. Editing is sometimes restricted on frequently vandalized pages. That doesn't appear to have happened here, and Trump's page was quickly restored to an earlier version after each deletion.
The Wikimedia Foundation, which runs Wikipedia, did not immediately respond to a request for comment -- nor did the Trump campaign.