[fortran, documentation, patch] ironing out some wrinkles

[FX Coudert]

> 2007-07-12  Daniel Franke  <franke.daniel@gmail.com>
>
> 	* invoke.texi: Unified upper- and lower-case in menus.
> 	(-w, -W): Removed, documented by gcc.
> 	* intrinsic.texi: Unified Class-section entries, added subroutine/ 
> function
> 	warning where appropiate.

OK