feat(services): add explanation to public properties
feat(services): add explanation to public properties

cironunes/angular-testing-recipes,andreybleme/angular-testing-recipes,rmdias/angular-testing-recipes,willmendesneto/angular-testing-recipes,cironunes/angular-testing-recipes,willmendesneto/angular-testing-recipes,andreybleme/angular-testing-recipes,rmdias/angular-testing-recipes