[3.12] gh-122944: Fix incorrect prompt strings in the Python Tutorial (GH-122949) (#122955)

gh-122944: Fix incorrect prompt strings in the Python Tutorial (GH-122949)

In the REPL, top level comments are followed by a primary, not secondary prompt.
Fix the places in the in the tutorial that use the latter.
(cherry picked from commit be90648fb2de58b148dcc7553a08ca646911baf2)

Co-authored-by: Damien <81557462+Damien-Chen@users.noreply.github.com>