docs: pt_BR: Reorganize process/index.rst to follow english structure

The main index.rst file for the pt_BR translation was grouping all
translated process documents directly in its toctree, which frequently
caused patch collisions among contributors.

Following Jonathan Corbet's suggestion, this patch introduces a new
pt_BR/process/index.rst that mirrors the subsection structure of the
English Documentation/process/index.rst. The translated documents are
now organized into their respective categories, rather than a single
flat list.

The root pt_BR/index.rst now simply references process/index.

This matches the upstream categorization and significantly reduces
merge conflicts for future pt_BR translations.

Signed-off-by: Daniel Pereira <danielmaraboo@gmail.com>
[jc: removed process/index.rst top-of-file label]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260813134741.11025-1-danielmaraboo@gmail.com>

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