[camera_android_camerax] Move misplaced Javadoc above annotations

[jesswrd]

Moved comments above the annotations to fix dangling-doc-comments compiler warning. This is part of the work to ensure packages works on JDK 25.

JDK 25's compiler added a dangling-doc-comments is a javac lint check that was new in JDK 23 (JDK-8303689) that warns when a Javadoc comment isnt attached to class, method, or field.

Partially Addresses flutter/flutter#193404

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[gemini-code-assist]

Code Review

This pull request updates the camera_android_camerax package to version 0.7.5+1 and resolves a build failure on JDK 23+ by moving the @VisibleForTesting and @NonNull annotations below the Javadoc comment for createOrientationEventListener in DeviceOrientationManager.java. There are no review comments, and I have no feedback to provide.

[camsim99]

No need for the changelog/pubspec update! otherwise lgtm