fix(platform): fix types and docs (#19944)

docs/usage/configuration-options.md

docs/usage/faq.md

docs/usage/getting-started/use-cases.md

lib/config/options/index.ts

lib/config/presets/local/index.spec.ts

lib/config/presets/local/index.ts

lib/constants/platforms.ts

lib/modules/manager/gomod/artifacts.ts

lib/modules/platform/api.ts

lib/modules/platform/gitea/index.md

lib/modules/platform/index.ts