[PATCH, Fortran] Various cleanups in invoke.texi dialect options

[Brooks Moses]

:ADDPATCH fortran:

This patch contains a multitude of minor cleanups and clarifications to 
the "Fortran Dialect Options" section in invoke.texi.  The only change 
that I would expect to be at all controversial would be the elaboration 
on the meanings of the -std= options.

Note that this patch must be applied after my previous patch regarding
-fno-range-check, which Steve Kargl has approved but not yet applied.
(This one, of course, will also need to be applied by the approver, as I
don't have write access.)

Changelog entry:

------
2006/09/30  Brooks Moses  <bmoses@stanford.edu>

	* invoke.texi: Minor cleanup and clarification to the Dialect
	Options section.
------

- Brooks
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