[Bug fortran/89348] Fortran Command Options documentation fixes

[mark.eggleston at codethink dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89348

--- Comment #1 from MarkEggleston <mark.eggleston at codethink dot com> ---
Created attachment 45715
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45715&action=edit
Change log for gcc/fortran for patch

Date has been omitted from change log. Can be added when committed.