Fix typo

[espertus]

Overview

I fixed a typo.

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I hereby agree to the terms of the JUnit Contributor License Agreement.

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Definition of Done

Some of these are not relevant, but I checked the boxes.

• There are no TODOs left in the code
• Method preconditions are checked and documented in the method's Javadoc
• Coding conventions (e.g. for logging) have been followed
• Change is covered by automated tests including corner cases, errors, and exception handling
• Public API has Javadoc and @API annotations
• Change is documented in the User Guide and Release Notes

[marcphilipp]

@espertus Thank you! 👍