Add description to options

Terms like Suspend, Hibernate, Lock, Halt aren't very descriptive. Couldn't we add short descriptions to explain the differences?
This would be relevant for the following settings:
- Power button
- When lid is closed
- When lid is closed with external monitor

For example:
- Suspend
Suspend and resume quickly, but requires power
- Hibernate
Suspend and resume slower, but doesn't require power
- Lock
Lock screen, require password to continue

Maybe we could add descriptions like "Format for item" in the following example?