doc: Correct ALTER USER MAPPING example

Peter Eisentraut <peter_e@gmx.net>

Commit: 4f6494cfd26c1dfe708c4598c11eea5fce168fd1
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2016-09-20T16:00:00Z
Releases: 10.0
doc: Correct ALTER USER MAPPING example

The existing example threw an error.

From: gabrielle <gorthx@gmail.com>

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doc/src/sgml/ref/alter_user_mapping.sgml modified +2 −2

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