Include more info on `zef smoke` command

[zoffixznet]

• Mention that it actually installs all the modules
• Say how are the results reported. Right now I see it says ===> Smoke result for IO::Prompter: NOT OK for example, but will it report all the results at the end or do I need to log the current results and then grep through them to find which modules fail

Also, does it handle already-installed modules properly?

I see this in the output. Which candidates are already installed? The ones reported as NOT OK? This is a fresh install so those got installed as part of smokage and should not be reported as NOT OK.

All candidates are currently installed
No reason to proceed. Use --force to continue anyway
===> Smoke result for HTTP::Easy:ver('1.1.0'): NOT OK
All candidates are currently installed
No reason to proceed. Use --force to continue anyway
===> Smoke result for HTTP::Status: NOT OK