fix typo in 'synchronized' documentation (backport #3388)

[mergify]

Description

Fix:

The thread will run with the synchronized with the main controller_manager thread.

->

The thread will run synchronized with the main controller_manager thread.

Fixes # (issue)

Is this user-facing behavior change?

Did you use Generative AI?

No.

Additional Information

TODOs

To send us a pull request, please:

• Fork the repository.
• Modify the source; please focus on the specific change you are contributing. If you also reformat all the code, it will be hard for us to focus on your change.
• Ensure local tests pass. (colcon test and pre-commit run (requires you to install pre-commit by pip3 install pre-commit)
• Commit to your fork using clear commit messages.
• Send a pull request, answering any default questions in the pull request interface.
• Pay attention to any automated CI failures reported in the pull request, and stay involved in the conversation.

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This is an automatic backport of pull request #3388 done by [Mergify](https://mergify.com).