[gfortran] Document some more GNU extensions

[Steve Kargl]

On Sun, May 22, 2005 at 05:40:33PM -0600, Roger Sayle wrote:
> 
> Ok for mainline?  After the unslush?

Yes, with one minor change.  I don't know what
Mark M's stance is with respect to documentation
changes, but I would think you can commit this
during the slush.

> + To support legacy codes, @command{gfortran} permits the count field
> + of the X edit descriptor in FORMAT statements to be ommitted.  When
> + ommitted, the count is implicitly assumed to be one.

omitted

Everything else looks okay to me.

-- 
Steve