[PATCH] Fix warnings from including fdl.texi into gnat-style.texi

[Tom de Vries]

Hi,

While generating gnat-style.info, we see these warnings:
...
src/gcc/doc/include/fdl.texi:33: warning: node `Index' is next for `GNU Free 
Documentation License' in menu but not in sectioning
src/gcc/doc/include/fdl.texi:33: warning: node `Top' is up for `GNU Free 
Documentation License' in menu but not in sectioning
...

Attached patch fixes these.

Ok for stage4?

Thanks,
- Tom
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