Python tutorial improvements (SBM feedback)

[Giom-V]

Description of the change

Minor improvements (wording, moving embeddings in the advance section...) as per PM feedback

Motivation

To make the tutorial easier to understand by newcomers

Type of change

Documentation

Checklist

• [X] I have performed a self-review of my code.
• [X] I have added detailed comments to my code where applicable.
• [X] I have verified that my change does not break existing code.
• [X] My PR is based on the latest changes of the main branch (if unsure, please run git pull --rebase upstream main).
• [X] I am familiar with the Google Style Guide for the language I have coded in.
• [X] I have read through the Contributing Guide and signed the Contributor License Agreement.