A patch for the 'geom' chapter

[Manolis Kiagias]

After our discussion, here again is the "second take" of this patch:

http://people.freebsd.org/~manolis/geom.txt

And the build starts here:

http://people.freebsd.org/~manolis/geom.html

I tried to address most points, but feel free to send more comments and
fixes.
Take your time, as I won't be looking at this further tonight (it will
only get worse if I do ;) )

Thank you all!
manolis@