documentation: updated crypto adapter info
documentation: updated crypto adapter info

The documentation for crypto adapters only includes CEX5S/6S generations.
I added information about 7S/8S and their supported models in the
Reference section.

Signed-off-by: marcos <242de1c2b3c1c98c3c6922420b4fc08b680629cf@ibm.com>

zhmcclient/python-zhmcclient,zhmcclient/python-zhmcclient