Fix maxLocation key in KOTH example

[GerwinVerkerk]

Problem

The current koth-example.yml documents the second KOTH corner under manLocation, while KothLoader reads maxLocation. Copying the example therefore gives the second corner its default location instead of the configured value.

Change

Rename only the example key from manLocation to maxLocation and restore the final newline.

There are no Java, API, gameplay, command, permission, placeholder, hook, or runtime behavior changes.

Verification

• Branch is based directly on upstream develop commit eafcfdf6eca8593110817531cf561258880c3e02.
• ./gradlew clean build --no-daemon completes successfully on Java 25.
• The loader key is maxLocation in KothLoader.