The online reference manual for UPower is version 0.9.8. If you try to call the documented Suspend method on a recent install, you will be frustrated. Because UPower removed the Suspend method.
It would be preferable if the online build of the docs described something more recent, than 0.9.8 from 7 years ago.
AFAICT these are generated from the source tree, so it doesn't require writing new docs.
Updated, thanks for opening the bug. Richard.