Fix a few errors in comments. Patch by Fujii Masao, plus the one in

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: efa8544fd55e408dc5a8a5a2b7722dc376d7d843
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2009-06-18T10:08:08Z
Releases: 8.4.0
Fix a few errors in comments. Patch by Fujii Masao, plus the one in
visibilitymap.c by me.

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