Update index.mdx

Author: barvian

site/src/pages/[...framework]/index.mdx

@@ -160,8 +160,8 @@ A custom prefix or suffix for the number.
 </Match>
 <Match vanilla>
 ```js
-flow.format={ style: 'currency', currency: 'USD', trailingZeroDisplay: 'stripIfInteger' }
-flow.numberSuffix="/mo"
+flow.format = { style: 'currency', currency: 'USD', trailingZeroDisplay: 'stripIfInteger' }
+flow.numberSuffix = "/mo"
 ```
 </Match>
 </SuffixDemo>