Scot pointed out that the dynamic zone example didn't seem to "flow"
with the rest of the examples, so after discussion with him and gshapiro,
re-sort the examples, and add more comments to make things very obvious.

Also, divide the examples between example.{com|net|org} to make things
even more obvious, and use the same RFC 1918 block for all examples.

Pointed out by: Scot W. Hetzel <hetzels@westbend.net>