Fix a few typos in comments in GiN.

Neil Conway <neilc@samurai.com>

Commit: dbcaee49b5352576a99995fb0afc82f7e2163e4f
Author: Neil Conway <neilc@samurai.com>
Date: 2007-02-01T04:16:08Z
Releases: 8.3.0
Fix a few typos in comments in GiN.

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