doc:it_IT: add some process/* translations

This patch does not translate entirely the subfolder "process/"
but only part of it (to begin with).

In order to avoid broken links, I included empty documents
for those which are not yet translated.

In order to be able to refer to all documents in "process/",
I added a sphinx label to those which had not one.

Translated documents:
- howto
- 1.Intro
- clang-format
- coding-style
- kernel-driver-statement
- magic-number
- volatile-considered-harmful
- development-process

Signed-off-by: Federico Vaga <[email protected]>
Signed-off-by: Alessia Mantegazza <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
diff --git a/Documentation/process/howto.rst b/Documentation/process/howto.rst
index dcb25f9..a4a9f9e 100644
--- a/Documentation/process/howto.rst
+++ b/Documentation/process/howto.rst
@@ -1,3 +1,5 @@
+.. _process_howto:
+
 HOWTO do Linux kernel development
 =================================