Fix typo in test comment.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 169a6588a71724e7932ece91d844b810b0dbed67
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2020-05-28T09:37:42Z
Releases: 12.4
Fix typo in test comment.

The same comment was copied to a few different places, with the same typo.
Backpatch down to v11, where this typo was introduced.

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