evolve: show `hg help evolve.interrupted-evolve` in error when conflicts
The help list various flags which you can use during interrupted evolve
resolution and description about what they do. This will be very helpful for
user on how to continue an interrupted evolve.
evolve: add a help topic `Interrupted-Evolve`
This help topic contains description on how the various flags work during
interrupted evolve. This help topic will be included in error message during
interrupted evolve in next patch.