Tutorial docs improvement metabug #11755
Description
Our tutorial(s) have problems.
This is a metabug to collect those issues together.
(A metabug seems especially appropriate when it comes to the manual and the tutorials, since someone fixing one problem in a document may be in a good position to fix other related problems, so cross-referencing here seems good.)
Do try to restrict the scope of this metabug to either pure documentation issues or to file organization / naming issues. (I.e. tooling for automatic testing or doc extraction is not part of the scope of this metabug.)