Graphicdesigning on "How to remove coding below each comment in our blog"

In our blog post, showing a coding below each comment (same as below)

function demo($mimes) {

if ( function_exists( 'current_user_can' ) )

$unfiltered = $user ? user_can( $user, 'unfiltered_html' ) : current_user_can( 'unfiltered_html' );

if ( !empty( $unfiltered ) ) {

$mimes['swf'] = 'application/x-shockwave-flash';

}

retu $mimes;

}

add_filter('upload_mimes','demo');

Please help to remove it, here is the screenshot of this error.