Update the "Dynamic items"'s code highlight line. (#3838)

The wrong highlight wasted me 1 hour to fix the null error

Author: choneas

apps/docs/content/docs/components/select.mdx

@@ -54,7 +54,7 @@ Select follows the [Collection Components API](https://react-spectrum.adobe.com/
 - **Static**: The usage example above shows the static implementation, which can be used when the full list of options is known ahead of time.
 - **Dynamic**: The example below can be used when the options come from an external data source such as an API call, or update over time.
 
-<CodeDemo title="Dynamic items" highlightedLines="8" files={selectContent.dynamic} />
+<CodeDemo title="Dynamic items" highlightedLines="7" files={selectContent.dynamic} />
 
 ### Multiple Selection