doc: Fix markup

Fujii Masao <fujii@postgresql.org>

Commit: 7c21a8aca39c504ea448cce82230163ca93cfaf4
Author: Fujii Masao <fujii@postgresql.org>
Date: 2015-02-04T10:00:42Z
Releases: 9.4.2
doc: Fix markup

Ian Barwick

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