doc: Fix ALTER PUBLICATION details

Peter Eisentraut <peter_e@gmx.net>

Commit: 185364b161512806d23ca390f5b615666079699b
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-05-30T15:48:39Z
Releases: 10.0
doc: Fix ALTER PUBLICATION details

Some of the text was made nonsensical by commit
e9500240661c03750923e6f539bfa2d75cfaa32a.  Fix that and make some other
minor changes.

Reported-by: Jeff Janes <jeff.janes@gmail.com>

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