Add missing property name in the update-raw-property example

Also fix a typo and update the specification date to 2014-01-28.
Merge branch 'jannispohlmann/fix-missing-raw-property-name'

Signed-off-by: Jannis Pohlmann <jannis.pohlmann@codethink.co.uk>
Reviewed-by: Adam Coldrick <adam.coldrick@codethink.co.uk>