[gfortran, patch]: Document ENUM stuff, reorganize docs

[Tobias Schlüter]

Tobias Schlüter wrote:
> Index: gfortran.texi
> ===================================================================
> --- gfortran.texi	(revision 106030)
> +++ gfortran.texi	(working copy)
> @@ -98,7 +98,8 @@ Boston, MA 02110-1301, USA@*
>  @contents
>  @page
>  
> -@node Top, Copying,, (DIR)
> +@node Top
> +@c , Copying,, (DIR)
>  @top Introduction
>  @cindex Introduction

Ugh, I forgot about that, somehow I needed to comment this, otherwise the
build would fail.  Can any texinfo expert enlighten me as to what this means?
 Otherwise, I'll just remove the comment.

Thanks,
- tobi