doc: remove incorrect limitation on AESNI-MB PMD
doc: remove incorrect limitation on AESNI-MB PMD

AESNI MB PMD supports sessionless operations,
but the documentation was stating that only
operations with session were supported.

Fixes: 924e84f87306 ("aesni_mb: add driver for multi buffer based crypto")
Cc: stable@dpdk.org

Signed-off-by: Pablo de Lara <28355d9cfe41bb8148aea0fb24f47aae8f4217a1@intel.com>
Acked-by: Declan Doherty <b4388acd850cd8caad5000a112795063f04807ac@intel.com>

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