doc: announce renaming of ethdev library

doc: announce renaming of ethdev library

The right name of ethdev should be dpdk_netdev. However:
1/ We are using rte_ prefix in the code and library names.
2/ The API uses rte_ethdev
That's why 16.11 will just have the rte_ prefix prepended to
the library filename as every other libraries.

Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>
Acked-by: Jan Viktorin <viktorin@rehivetech.com>
Acked-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>