VALUES lists aliases

Next from the stream of doc comments, someone points out that if you
read http://www.postgresql.org/docs/current/static/queries-values.html a
beginner may not understand just what " table alias list" means. If you
start at the beginning of the chapter it makes more sense, but it isn't
necessarily obvious even then.

Easiest fix is to demonstrate this by example, so that's what the
attached patch adds. There was an example of this approach in the full
documentation of VALUES already, but I felt that one was too complicated
for a tutorial section.

--
Greg Smith 2ndQuadrant US greg(at)2ndQuadrant(dot)com Baltimore, MD
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