doc: Fix markup

Fujii Masao <fujii@postgresql.org>

Commit: c036edb7b35fda18b93a6eacac5b14fcee4693a4
Author: Fujii Masao <fujii@postgresql.org>
Date: 2015-02-04T10:00:09Z
Releases: 9.5.0
doc: Fix markup

Ian Barwick

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