Add documentation for printPlaygroundLink configuration option. Relates to testing-library/dom-testing-library#837

Author: mathiassoeholm

docs/dom-testing-library/api-configuration.mdx

@@ -61,6 +61,9 @@ fail. Takes the error message and container object as arguments.
 `asyncUtilTimeout`: The global timeout value in milliseconds used by `waitFor`
 utilities. Defaults to 1000ms.
 
+`printPlaygroundLink`: When enabled, a link to the Testing-Library playground
+will be logged when a query fails. Defaults to `true`.
+
 <Tabs defaultValue="native" values={[ { label: 'Native', value: 'native', }, {
 label: 'React', value: 'react', }, { label: 'Cypress', value: 'cypress', }, ] }>
 <TabItem value="native">