[PATCH, doc] minor fixups

[Tobias Burnus]

Ralf Wildenhues wrote:
> Split of Fortran-specific bits off of
> <http://gcc.gnu.org/ml/gcc-patches/2008-06/msg00920.html>.
> Please see there for rationale.
>   
Which is:
> 1) Indentation in .texi is unfortunately mostly preserved in the info
> output, showing up as extraneous inter-word spacing in the middle of a
> line.  Also, TABs usually mess up the indentation; they are best
> avoided, except maybe in @example Makefiles.
>   

> Tested 'make info html pdf'.  OK for trunk?
>   
Yes, thanks for taking care of the docs.

Tobias