Fix typos in comments.

Fujii Masao <fujii@postgresql.org>

Commit: a26ae56f5173f1f8990ccf134730b964506f29ba
Author: Fujii Masao <fujii@postgresql.org>
Date: 2014-06-11T11:54:06Z
Releases: 9.5.0
Fix typos in comments.

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