Fix typos in comment and log message.

Fujii Masao <fujii@postgresql.org>

Commit: 9e0e5550c5f273dc4133687b1a682eb39933f47e
Author: Fujii Masao <fujii@postgresql.org>
Date: 2017-04-17T18:19:39Z
Releases: 10.0
Fix typos in comment and log message.

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