doc: Remove some confusion from pg_archivecleanup doc

Peter Eisentraut <peter_e@gmx.net>

Commit: 639166641102871e09f9c4aebc71df57566a0a4a
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2016-08-16T19:33:52Z
Releases: 10.0
doc: Remove some confusion from pg_archivecleanup doc

From: Jeff Janes <jeff.janes@gmail.com>

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doc/src/sgml/ref/pgarchivecleanup.sgml modified +1 −1

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