Add a section about basic zfs send and receive.  This is based on an older
example and might need updates to represent the current zfs version we have.
It shows how to send zfs data streams locally and remote (via SSH) with
example commands and output.
Minor corrections and wording fixes.
The section on zfs send over SSH needs to be more clear about what exactly
needs to happen on each system for this to work.  This will be done in a
separate commit.

Submitted by:	bjk@
Remove superfluous "via".

Spotted by:	wblock@