doc:it_IT: align Italian translation

doc:it_IT: align Italian translation

Translation for the following patches:

commit c4e98aac2074 ("docs: Add documentation for Symbol Namespaces")
commit 90dcf2886b36 ("kernel-doc: rename the kernel-doc directive 'functions' to 'identifiers'")
commit 9efd3326fae8 ("Makefile: Globally enable fall-through warning")
commit 495e88f0fc2a ("Documentation/process: Add fallthrough pseudo-keyword")
commit 79f4fc61ad95 ("docs: fix reference to core-api/namespaces.rst")
commit 8faf8c5460d1 ("Documentation: bring process docs up to date")
commit 3dee866c9bae ("docs: deprecated.rst: Add BUG()-family")
commit 2057293099fd ("docs: Remove :c:func: from process/deprecated.rst")
commit 070b724051f7 ("docs: deprecated.rst: Clean up fall-through details")
commit 238c39558a5c ("docs: deprecated.rst: Add %p to the list")
commit 9a780a554460 ("docs: locking: Drop :c:func: throughout")
commit d3c2344d2b9e ("docs: locking: Add 'need' to hardirq section")

Signed-off-by: Federico Vaga <federico.vaga@vaga.pv.it>
Link: https://lore.kernel.org/r/20200430222037.4480-1-federico.vaga@vaga.pv.it
Signed-off-by: Jonathan Corbet <corbet@lwn.net>