[Maran23]

Very minor PR to fix a typo and have the same @WritesDefaultLocale notation as the other two annotations in the Javadoc.

I was checking out the new JUnit 6.1 RC and especially the new @DefaultLocale and @SetSystemProperty.
Found this typos on the way reading and using them.

Background: We are using JUnit at JavaFX, where we migrated away from JUnit 4 -> JUnit 5 (openjdk/jfx#1774) and soon to JUnit 6 (directly to 6.1 probably).
Just want to let you know that those two extensions will be very helpful for us, thanks!

EDIT: Just signed the commit, amended and force pushed it.

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Definition of Done

• 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