docs: pt_BR: Translate process/kernel-docs.rst into Portuguese

Translate Documentation/process/kernel-docs.rst into Portuguese (pt_BR)
and update the main index.

The content was adapted following t

docs: pt_BR: Translate process/kernel-docs.rst into Portuguese

Translate Documentation/process/kernel-docs.rst into Portuguese (pt_BR)
and update the main index.

The content was adapted following the RST formatting rules and the
appropriate technical terminology for Brazilian Portuguese.

Signed-off-by: Daniel Pereira <danielmaraboo@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260519140035.1031694-1-danielmaraboo@gmail.com>

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