[3.12] Improve references in the tutorial (GH-108069) (#108203)

[3.12] Improve references in the tutorial (GH-108069) (#108203)

Improve references in the tutorial (GH-108069)

* Use full qualified names for references (even if they do not work now,
  they will work in future).
* Silence references to examples.
(cherry picked from commit 622ddc41674c2566062af82f7b079aa01d2aae8c)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>