cryptodev: extend info get function documentation
cryptodev: extend info get function documentation

Extend the Doxygen documentation of rte_cryptodev_info_get,
to describe how it returns the capabilities of a device.

Signed-off-by: Billy O'Mahony <cecb248233c8a1ca95a997fb7f04c7ff88f625a2@intel.com>
Acked-by: Fiona Trahe <7ba562cc372916cd557d0be347608f8b4da4f746@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk