Added phpdoc to safedescr() function

includes/common.php

@@ -490,6 +490,11 @@ function safename($name)
     return preg_replace('/[^a-zA-Z0-9,._\-]/', '_', $name);
 }
 
+/**
+ * Function format the rrdtool description text correctly.
+ * @param $descr
+ * @return mixed
+ */
 function safedescr($descr)
 {
     return preg_replace('/[^a-zA-Z0-9,._\-\/\ ]/', ' ', $descr);