NEWS.md: Update for 1.2 release

Change-Id: Ie7ddcb33bb09a1172158aeaeff6f7cf5fae3c34d
Signed-off-by: Ciara Loftus <ciara.loftus@intel.com>
Reviewed-by: Mark Kavanagh <mark.b.kavanagh@intel.com>
Acked-by: Kevin Traynor <kevin.traynor@intel.com>
docs: Updated docs from usability testing

Change-Id: I6af60d48934cc4237a7ce2a1f93958076a5360b2
Signed-off-by: Rory Sexton <rory.sexton@intel.com>
Reviewed-by: Ciara Loftus <ciara.loftus@intel.com>
Acked-by: Kevin Traynor <kevin.traynor@intel.com>