Add missing article

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

Commit: abb17ae010261821c3fb6bf5f16b8bc0e870d276
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2018-02-12T14:48:28Z
Releases: 10.3
Add missing article

Noticed while reviewing nearby text

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doc/src/sgml/ddl.sgml modified +1 −1

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