Documenation: update duo chat model usage

...self_hosted/supported_models_and_hardware_requirements.md

doc/administration/gitlab_duo_self_hosted/troubleshooting.md

doc/development/ai_features/glossary.md

doc/solutions/integrations/aws_googlecloud_ollama.md

doc/user/discussions/_index.md

doc/user/duo_workflow/_index.md

doc/user/gitlab_duo_chat/_index.md

doc/user/gitlab_duo_chat/examples.md

doc/user/project/merge_requests/changes.md

doc/user/project/merge_requests/duo_in_merge_requests.md

doc/user/project/repository/code_explain.md

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