Rename GFDL license rule

Signed-off-by: Philippe Ombredanne <pombredanne@nexb.com>

Author: pombredanne

src/licensedcode/data/rules/gfdl-1.1-plus_26.RULE

@@ -0,0 +1,12 @@
+---
+license_expression: gfdl-1.3-invariants-or-later
+is_license_notice: yes
+---
+
+Permission is granted to copy, distribute and/or
+modify this document under the terms of the {{GNU Free Documentation License,
+Version 1.3 or any later version }} published by the Free Software Foundation;
+with {{the Invariant Sections being}} ,
+with {{the Front-Cover Texts being}} ,
+and with {{the Back-Cover Texts}} being . A copy of the
+license is included in the section entitled "GNU Free Documentation License".