Doc: Fix example related to partition pruning

Michael Paquier <michael@paquier.xyz>

Commit: 37ad1266147626bfe505b2c5b016497605915a8e
Author: Michael Paquier <michael@paquier.xyz>
Date: 2019-09-25T04:44:43Z
Releases: 12.0
Doc: Fix example related to partition pruning

Append node has been removed in v12 when there would be only one subnode
under it.

Author: Amit Langote
Discussion: https://postgr.es/m/CA+HiwqHhS62w8zUFXF4NBjvMboCXYnD-jWoWp-tfo2aHvP3Gxg@mail.gmail.com
Backpatch-through: 12

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doc/src/sgml/ddl.sgml modified +2 −3

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