PR modula2/116557: Remove physical address from COPYING.FDL

This patch removes the physical address from the COPYING.FDL and
replaces it with a URL.

gcc/m2/ChangeLog:

	PR modula2/116557
	* COPYING.FDL: Remove physical address and replace with a URL.

Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>

gcc/m2/COPYING.FDL

@@ -3,7 +3,7 @@
 
 
  Copyright (C) 2000-2025 Free Software Foundation, Inc.
-     51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ <http://fsf.org/>.
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.