[patch, fortran] ATAN2 and -fsign-zero doc fixes

[Steve Kargl]

On Mon, Nov 07, 2011 at 11:09:52PM +0100, FX wrote:
> Hi all,
> 
> Attached patch fixes the documentation of ATAN2 regarding signed zeros (aka PR49336) and the documentation of option -fsign-zero regarding I/O behaviour (aka PR49188). While I was at it, I also removed some lonely contractions (it's, 'll, can't, don't, etc.)
> 
> Tested with "make man info html pdf", OK to commit to trunk?
> 

OK.

-- 
Steve