Add data-article to citable document types documentation

[Copilot]

The data-article document type was added to CITABLE_DOCUMENT_TYPES in choices.py but was missing from the documentation reference list, causing documentation-code inconsistency.

Changes

• docs/source/public_reports.rst: Added data-article to the citable documents list (line 796)

The constant is imported by 16 modules across publication, accesses, bibliometric, and evaluation subsystems. Documentation now reflects that data-article documents are treated as citable in impact factor calculations and all metrics exports.

# choices.py (already present)
CITABLE_DOCUMENT_TYPES = (
    'data-article',
    u'article-commentary',
    u'brief-report',
    u'case-report',
    u'rapid-communication',
    u'research-article',
    u'review-article'
)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Processing] Considerar nas métricas o tipo de documento data-article como citável</issue_title>
<issue_description>### Descrição da tarefa
Considerar nas métricas o tipo de documento data-article como citável.
Este issue atende parte da resolução de outro issue: scieloorg/articles_meta#183

Considerações e notas

Rastrear o código para verificar se poderá ocorrer outros impactos baseados nesta tarefa.

Arquivos que serão afetados:
https://github.com/scieloorg/processing/blob/master/docs/source/public_reports.rst - linha 797
https://github.com/scieloorg/processing/blob/master/choices.py#L14

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Processing] Considerar nas métricas o tipo de documento data-article como citável #44

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