User Guide - PT - Fix Syntax error

Fix Syntax error in:
- docs/languages/pt/user-guide/conclusion.rst
- docs/languages/pt/user-guide/database-and-models.rst
- docs/languages/pt/user-guide/forms-and-actions.rst
- docs/languages/pt/user-guide/modules.rst
- docs/languages/pt/user-guide/overview.rst
- docs/languages/pt/user-guide/routing-and-controllers.rst
- docs/languages/pt/user-guide/skeleton-application.rst
- docs/languages/pt/user-guide/styling-and-translations.rst

instância, Nós