Changed metadata and capitalization

doc/api/api_resources.md

doc/api/code_suggestions.md

doc/architecture/blueprints/ai_gateway/index.md

doc/development/ai_architecture.md

doc/development/code_suggestions/index.md

doc/development/internal_api/index.md

doc/user/discussions/index.md

doc/user/project/merge_requests/reviews/index.md

doc/user/project/repository/code_suggestions/index.md

doc/user/project/repository/code_suggestions/saas.md

doc/user/project/repository/code_suggestions/self_managed.md

...er/project/repository/code_suggestions/troubleshooting.md

doc/user/project/repository/jupyter_notebooks/index.md