The question is closed and I don't understand why.
It is a valid question and I do
remember that this was a topic on this list as well:
show document/help text in configuration browser/
tooltip for packages in Nautilus/
comment package like it is done for classes.
For that user, who asked the question on SO:
At least for external packages there are sometimes some
information on github or squeaksource and we should show him
a link to the pharo user mailing list.