doc:it_IT: translation alignment

Align Italian translation after the following changes in Documentation

bba757d8 coding-style.rst: Generic alloc functions do not need OOM logging
d8e8bcc3 docs: doc-guide: remove the extension from .rst files

Signed-off-by: Federico Vaga <federico.vaga@vaga.pv.it>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>