adding S2 testing docs

Author: LFDanLu

packages/dev/s2-docs/pages/react-aria/testing.mdx

@@ -3,7 +3,6 @@ import {InstallCommand} from '../../src/InstallCommand';
 import {Layout} from '../../src/Layout';
 export default Layout;
 
-import docs from 'docs:react-aria-components';
 import testUtilDocs from 'docs:@react-aria/test-utils';
 import {InlineAlert, Heading, Content} from '@react-spectrum/s2'