RSS and Post edits

It should since the RSS feed is based on the current instance of WP_Query. However by default WordPress has a longer interval for updating the RSS feed’s cache. IIRC, it’s about 12 hours. So if you make a change at 6am, the RSS feed won’t reflect that until 6pm.

You can change this with the following code in your functions.php file or, even better, as a plugin.

function rss_update_feed() {
    return 60;  //Time in seconds
}
add_filter( 'wp_feed_cache_transient_lifetime', 'rss_update_feed' );

What this code does is sets the refresh time to 60 seconds. You will want to set it to something a bit more reasonable though. I only used 60 seconds as an example but you do not want to have your server keep doing unnecessary refreshes.