Add comment to explain functionality of code

Thanks to:	rpokala

etc/defaults/rc.conf

@@ -716,6 +716,7 @@ if [ -z "${source_rc_confs_defined}" ]; then
 				;;
 			esac
 		done
+		# Re-do process to pick up [possibly] redined $rc_conf_files
 		for i in ${rc_conf_files}; do
 			case ${sourced_files} in
 			*:$i:*)