No functional changes, just make a couple of minor tweaks to the
comments for edit_metadata():
* There are four elements to be returned by the callback function
* Add an example return statement for when you don't want to modify the
value
(Bitbake rev: 99675c19375c96140bc8ae8f9fc3a1945a77cebb)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>