bug#23876: [Guix Info][7.1.4] Should remind user to add a swap partition

[Eus]

Hi guys!

If I may suggest, in Guix info that is displayed at console Alt+F2, a user 
should be reminded to add a swap partition.

I forgot to do that first time, and so my "guix system --fallback init 
/mnt/etc/config.scm /mnt" got killed by OOM killer after about 10 hours.

Even if a user is not building from source, a swap partition should be handy in 
case the RAM is limited and/or in case hibernating is later desired.

BTW, I am capable of making patches. So, if you'd like me to make a patch, just 
tell me the source tree to make a diff against.

Thank you.

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Eus (FSF member #4445)

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