NEWS: Fix typos

There were some issues in this file:

* The 'stats_core' argument applies to 'ovs-dpdk', not 'ovs-vswitchd'.
* Many of the other changes apply only to the datapath ('ovs-dpdk').
  Reorder to indicate this fact.
* The date is incorrect.
* Lines were wrapped, but shouldn't have been
* A URL did not give the hyperlink

Change-Id: I9839c22b644237a590ec2a2c4af68e933494081d
Signed-off-by: Stephen Finucane <stephen.finucane@intel.com>
Reviewed-by: Meghan Halton <meghan.halton@intel.com>
Reviewed-by: Kevin Traynor <kevin.traynor@intel.com>