Improve section "Data Structures" in the tutorial

Documentation

The "More on Lists" subsection in the "Data Structures" section (Doc/tutorial/datastructures.rst) is the only place in the tutorial that contains formal definitions using Sphinx directives. They mostly duplicate descriptions in the library reference, and index entries refer to ones in the library reference, not in the tutorial. The list class is the only class whose methods are described so in the tutorial. The tutorial perhaps do not need such formal descriptions of all these methods. We could do like with other builtin functions and methods of other builtin classes, and simply add references to their real descriptions.

References to many methods of built classes did not work until recently. This might be one of reasons of exisiting such section.

This was discussed in https://discuss.python.org/t/a-small-typo-on-5-1-more-on-lists-section/106150. cc @nedbat

Inizia con Doc/tutorial/datastructures.rst e la sua sottosezione "More on Lists", poi confronta le descrizioni formali dei metodi con le loro controparti nella documentazione di riferimento della libreria. Controlla la discussione recente per il contesto; il lavoro è completo quando il tutorial evita definizioni duplicate non necessarie mantenendo al contempo riferimenti funzionanti alle descrizioni reali.