Fix typos in comments.

Noah Misch <noah@leadboat.com>

Commit: d098b236f301d8e805f3c4d7fe940230c65d7a88
Author: Noah Misch <noah@leadboat.com>
Date: 2014-06-11T23:50:29Z
Releases: 9.5.0
Fix typos in comments.

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