doc: Fix typo

Peter Eisentraut <peter_e@gmx.net>

Commit: a956bf439584ac5955ccf4e9c1a9aed2e9c4c95c
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2016-05-02T01:37:43Z
Releases: 9.6.0
doc: Fix typo

From: Guillaume Lelarge <guillaume@lelarge.info>

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doc/src/sgml/xindex.sgml modified +1 −1

Documentation touched