docs(ros2): add MAVROS IMU topic to ros2_bridge.py docstring

[DsThakurRawat]

Description

Added the MAVROS IMU topic mapping (/mavros/imu/data) directly into the ros2_bridge.py module-level docstring to guide drone operators.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Infrastructure / CI update

How Has This Been Tested?

• pytest tests/ passes locally
• reflex doctor sanity check
• Other (please specify): Docstring verification

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have kept the PR scoped to a single concern (one concern per PR)

[rylinjames]

Closing — #133 (the pluggable state-extractor PR) rewrote the ros2_bridge.py module docstring with the canonical MAVROS topic recommendation (/mavros/local_position/odom for full state, /mavros/imu/data for orientation fallback) plus a state-extractor table. The drone doc surface is now covered in source. Thanks @DsThakurRawat — credit preserved on #133 via Co-Authored-By.