doc: Fix missing imports in callback documentation
Modify the keys download example to reflect the change in specifying projects as part of the URL.
Signed-off-by: Senthil Kumaran S senthil.kumaran@linaro.org
Modify the keys download example to reflect the change in specifying projects as part of the URL.
Signed-off-by: Senthil Kumaran S senthil.kumaran@linaro.org