docs: it: license-rules.rst: get rid of warnings

There's a wrong identation on a code block, and it tries to use
a reference that was not defined at the Italian translation.

    Documentation/translations/it_IT/process/license-rules.rst:329: WARNING: Literal block expected; none found.
    Documentation/translations/it_IT/process/license-rules.rst:332: WARNING: Unexpected indentation.
    Documentation/translations/it_IT/process/license-rules.rst:339: WARNING: Block quote ends without a blank line; unexpected unindent.
    Documentation/translations/it_IT/process/license-rules.rst:341: WARNING: Unexpected indentation.
    Documentation/translations/it_IT/process/license-rules.rst:305: WARNING: Unknown target name: "metatags".
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Reviewed-by: Federico Vaga <federico.vaga@vaga.pv.it>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/translations/it_IT/process/license-rules.rst

@@ -303,7 +303,7 @@ essere categorizzate in:
      LICENSES/dual
 
    I file in questa cartella contengono il testo completo della rispettiva
-   licenza e i suoi `Metatags`_.  I nomi dei file sono identici agli
+   licenza e i suoi `Metatag`_.  I nomi dei file sono identici agli
    identificatori di licenza SPDX che dovrebbero essere usati nei file
    sorgenti.