Guide: no documentation for license

[Jeremy Lavergne]

> I just noticed that there is actually no documentation for "license" neither in the Guide nor in the man page.
> 
> Since I noticed that GPL-3 seems to be preferred instead of GPL3 I just meant to ask where to find info about which license notations are valid.
> 
> I'd add a piece of text to the Guide to section 5.1 accordingly.

Consider matching:
https://trac.macports.org/wiki/snc/licenses

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