[3.13] feat(docs): type fix - apply pep8 by using docstring instead of comment in the doc. (GH-135181) (#135211)

feat(docs): type fix - apply pep8 by using docstring instead of comment in the doc. (GH-135181)

Giving the right example incitates the tutorial readers to do the same in the future.
(cherry picked from commit 343182853f19a42c0ba8980d3104076a8c7bcfe7)

Co-authored-by: Jean-Louis GUENEGO <jlguenego@gmail.com>