Fix misc typos in comments.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 1d3b258cbe4aedfb49c92c28b9cbd7c18d277e04
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2014-03-18T19:05:18Z
Releases: 9.4.0
Fix misc typos in comments.

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