User blog comment:DocTanner/Discussing Trivia Guidelines/@comment-3475363-20131012141232

Verifiable Fact : Information that is verifiably accurate and not subject to opinion, speculation, or personal judgment.
 * 1) Trivia under this category may be stated as fact.

"Jinx is the first champion to have all ability names, including her innate, ending with an exclamation mark."

It's simply a fact.