doc:it_IT: fix some typos

Fix of some typos spotted reading documentation in italian and latest
changes for 6.4

Signed-off-by: Fabio Fantoni <fantonifabio@tiscali.it>
Reviewed-by: Federico Vaga <federico.vaga@vaga.pv.it>
Link: https://lore.kernel.org/r/20230425110158.9755-1-fantonifabio@tiscali.it


Signed-off-by: Jonathan Corbet <corbet@lwn.net>