fix lint

Author: Abinet18

examples/web/examples/react-spa/index.js renamed to examples/web/examples/react-spa/index.jsx

@@ -32,7 +32,7 @@ const common = {
       'examples/user-interaction/index.js'
     ),
     navigation: path.resolve(__dirname, 'examples/navigation/index.js'),
-    'react-spa': path.resolve(__dirname, 'examples/react-spa/index.js'),
+    'react-spa': path.resolve(__dirname, 'examples/react-spa/index.jsx'),
   },
   output: {
     path: path.resolve(__dirname, 'dist'),