Updated JavaDoc header for Rotate.java

[dtonhofer]

The current JavaDoc header erroneously says the example given (a rotation around Z in 2D) is generic. The header is otherwise hard to read, I tried to ameliorate it.

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[bridgekeeper[bot]]

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❗ This change is not yet ready to be integrated. See the Progress checklist in the description for automated requirements.

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@dtonhofer This pull request has been inactive for more than 4 weeks and will be automatically closed if another 4 weeks passes without any activity. To avoid this, simply issue a /touch or /keepalive command to the pull request. Feel free to ask for assistance if you need help with progressing this pull request towards integration!

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@dtonhofer This pull request has been inactive for more than 8 weeks and will now be automatically closed. If you would like to continue working on this pull request in the future, feel free to reopen it! This can be done using the /open pull request command.