Fix a few more double words in docs.

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 1aefa0489f0b6baccc7376b5e1135ae1c1cad0af
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2007-05-03T15:47:48Z
Releases: 8.3.0
Fix a few more double words in docs.

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