little cleanup: insert new line at the end

mod/help.php

@@ -50,4 +50,4 @@ function help_content(&$a) {
 	$html = "<style>.md_warning { padding: 1em; border: #ff0000 solid 2px; background-color: #f9a3a3; color: #ffffff;</style>".$html;
 	return $html;
 
-}
+}