The version has the words: "He would recite the supplication of the witr." He did not mention the words: "I say them in the witr." Abu Dawud said: The name of Abu al-Hawra' is Rabi'ah b. Shaiban.
هَذَا يَقُولُ فِي الْوِتْرِ فِي الْقُنُوتِ وَلَمْ يَذْكُرْ أَقُولُهُنَّ فِي الْوِتْرِ