Documentation: Fix Machine-Dependent Options ordering

Documentation: Fix Machine-Dependent Options ordering

Per comments in invoke.texi, target option groups in the Option
Summary section are supposed to be alphabetized and in the same order
as the documentation sections they refer to.  "M32C Options" was
misordered in the Option Summary.  "Cygwin and MinGW Options" was
ordered incorrectly in both places, which also caused Texinfo
diagnostics because the ordering in the menu (which was correctly
alphabetized) didn't match the node order.

I also added a reference to the appropriate section to each entry in
the Option Summary so that you can go directly to the detailed
description for that set of target options.  I'm not real happy with
the formatting of the tables in that section but the experiments I
tried all looked worse.  :-(

gcc/ChangeLog
	* doc/invoke.texi (Option Summary): Put "M32C Options" and
	"Cygwin and MinGW Options" in alphabetical order.  Add
	cross-references.
	(Cygwin and MinGW Options): Likewise move the section to its
	correct alphabetical location.
	* config/lynx.opt.urls: Regenerated.
	* config/mingw/cygming.opt.urls: Regenerated.