NEWS: Add entry for new appctl dpif-netdev/pmd-rxq-rebalance.

This feature was added earlier but we thought it better to
advertise in NEWS after there was stats provided to help
the user decide whether they should use it.

Signed-off-by: Kevin Traynor <ktraynor@redhat.com>
Signed-off-by: Ian Stokes <ian.stokes@intel.com>

NEWS

@@ -42,6 +42,8 @@ Post-v2.8.0
           "management" statistics.
         - ovs-ofctl dump-ports command now prints new of set custom statistics
           if available (for OpenFlow 1.4+).
+     * New appctl command 'dpif-netdev/pmd-rxq-rebalance' to rebalance rxq to
+       pmd assignments.
      * Add rxq utilization of pmd to appctl 'dpif-netdev/pmd-rxq-show'.
    - Userspace datapath:
      * Output packet batching support.