Fix typo in test comment.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 25fc24ba90df99d3c331627f3e4efb795a440dd0
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2020-05-28T09:37:55Z
Releases: 11.9
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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