* doc/fdl.texi: Fix typo (missing '@').
Somehow this was in fdl.texi but not fdl-1.3.texi.Oh, good. I apparently failed to copy the updated fdl.texi from www/licenses to gnustandards, which I used as the master for gnulib's copy, for convenience, since the FSF didn't want an actual file named "fdl.texi" in www/licenses. Sigh. (At least there are no other changes besides that @.) k
