Update changelog/6498.improvement.md
Update changelog/6498.improvement.md

Co-authored-by: ricwo <6d01c4d5f3745701436bc9aec9854ad11680340d@users.noreply.github.com>
RasaHQ/rasa_nlu,RasaHQ/rasa_nlu,RasaHQ/rasa_nlu