doc: Clarify psql --list documentation a bit more

Peter Eisentraut <peter_e@gmx.net>

Commit: 6dbae688d8526e4f277c4a7bf85497e03a947e59
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2018-02-03T15:20:42Z
Releases: 10.2
doc: Clarify psql --list documentation a bit more

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doc/src/sgml/ref/psql-ref.sgml modified +9 −3

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