This patch improves the access rules API documentation
to include IPv6 information that was missing.
It includes a note on user guide and changes an access list
example to IPv6.
Change-Id: I5a9ff4e3c8a70cb0b14caa39f5f17740b17b719a
Closes-Bug: #1705045
Signed-off-by: Douglas Viroel <viroel@gmail.com>