message: core-api: use type instead of interface to declare ConfigApi
diff: @@ -17,7 +17,7 @@ import { createApiRef } from '../ApiRef';
  import { Config } from '@backstage/config';
  // Using interface to make the ConfigApi name show up in docs
  -export interface ConfigApi extends Config {}
  +export type ConfigApi = Config;
  export const configApiRef = createApiRef<ConfigApi>({
  id: 'core.config',
  