Fix comment.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 405cb356d6104eccf34acc2e4944d711b0961c7d
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2018-07-19T12:39:06Z
Releases: 12.0
Fix comment.

This comment was copy-pasted from nodeAppend.c to nodeMergeAppend.c, but
while committing 5220bb7533, I modified wrong copy of it.

Spotted by David Rowley

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