If it was a typed comment then it is even easier to see it as a mistake than if it had been spoken. It would be hard to confuse 'choice' with 'choke' in speech. However, the letters o and i (the correct letters) are right above the letter k (the typo letter). He must have hit the wrong key 'k' instead of one of the correct letters, and the spellcheck changed it to choke without him noticing.