[wwwdocs] Update Fortran secrion in 4.8/changes.html

[Tobias Burnus]

Gerald Pfeifer wrote:
> One question: in general we are using the term "command-line option".
> You are introducing two uses of "flag", and the two existing uses of
> that are also in the Fortran section.  Is this Fortran terminology or
> would it be fine to make this more consistent?

Well, "flag" is GCC teminology (see "man gcc"), though it seems to be 
only used for the -f* options while I (mis)used it here for -W*. I think 
it is better to use the more common term "command-line option".

Tobias