Convert Caption in Attachments to a RTE

addtofunction.php

function vicky($form_fields) {
	preg_match('/name="([^"]*)/', $form_fields["post_excerpt"]["html"], $matches);
	$args = array("textarea_name" => $matches[1], "media_buttons" => false, 'quicktags' => true, 'textarea_rows' => '5');
	preg_match('/>(.*)</', $form_fields["post_excerpt"]["html"], $matches);
	ob_start();
	wp_editor( html_entity_decode($matches[1]), "wpet_options[textarea_one]", $args );
	$html = ob_get_clean();
	$form_fields["post_excerpt"]["input"] = "html";
	$form_fields["post_excerpt"]["html"] = $html;
	return $form_fields;
}
add_filter("attachment_fields_to_edit", "vicky");