add the note for catkin_prepare_release. (backport #5713)

[mergify]

Description

Part of ros/rosdistro#46433

Note: https://docs.ros.org/en/rolling/How-To-Guides/Releasing/First-Time-Release.html#bump-the-package-version requires uncheck Require a pull request before merging for the repository rule, otherwise the remote rejects the change. this would be good to add the documentation.

Did you use Generative AI?

No

Additional Information

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This is an automatic backport of pull request #5713 done by [Mergify](https://mergify.com).

[github-actions]

HTML artifacts: https://github.com/ros2/ros2_documentation/actions/runs/15573150221/artifacts/3301422088.

To view the resulting site:

1. Click on the above link to download the artifacts archive
2. Extract it
3. Open html-artifacts-5720/index.html in your favorite browser