doc: Update upload documentation.
doc: Update upload documentation.

Change-Id: I5e51acbdb64d1aad65ab5a45a5c546d6f1fce968

joyxu/kernelci-backend,kernelci/kernelci-backend,kernelci/kernelci-backend,joyxu/kernelci-backend,joyxu/kernelci-backend