docs: Update for 1.2 release

Change-Id: Ib8e6830e58e4a5fa9909243b56c4dfa07ab01fdb
Signed-off-by: Ciara Loftus <ciara.loftus@intel.com>
Reviewed-by: Mark Kavanagh <mark.b.kavanagh@intel.com>
Reviewed-by: Stephen Finucane <stephen.finucane@intel.com>
(cherry picked from commit c8980aca591da362d39a83b1e732b733645804fb)