docs: Fix typo: a -> an

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 3beb46ae8118f64d94518ba105b5e5c79e2ce194
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2018-03-12T15:58:35Z
Releases: 11.0
docs: Fix typo: a -> an

David Rowley

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doc/src/sgml/ddl.sgml modified +1 −1

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