bpo-35250: Correct argument name "num" -> "btn" in turtle docs. (GH-10565)

(cherry picked from commit 4edeaeac4c194ba5d09187640b5cfca5e03be617)

Co-authored-by: Srinivas  Thatiparthy (శ్రీనివాస్  తాటిపర్తి) <thatiparthysreenivas@gmail.com>
2 files changed