Fix raycaster vertical drift comment

[AngLi-00]

Description

Update the outdated comment where raycaster vertical drift is applied.

Fixes #4144

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist

• [ x ] I have read and understood the contribution guidelines
• [ x ] I have run the pre-commit checks with ./isaaclab.sh --format
• I have made corresponding changes to the documentation
• [ x ] My changes generate no new warnings
• [ x ] I have added tests that prove my fix is effective or that my feature works
• I have updated the changelog and the corresponding version in the extension's config/extension.toml file
• [ x ] I have added my name to the CONTRIBUTORS.md or my name already exists there

[greptile-apps]

Greptile Summary

Updated an outdated comment in the RayCaster class to correctly describe the vertical drift implementation. The previous comment incorrectly stated that vertical drift was applied to "ray starting position", when in reality the code applies it to the z-coordinate of the detected hit positions after raycasting completes.

• Fixed misleading comment at ray_caster.py:307-308 to accurately explain that vertical drift modifies hit positions rather than ray geometry
• Added @Ang Li to the contributors list in alphabetical order

Confidence Score: 5/5

• This PR is safe to merge with no risk - it only corrects a documentation comment
• The change is purely cosmetic, correcting an inaccurate comment without modifying any logic or behavior. The new comment accurately describes what the code does (applying vertical drift to hit positions, not ray starts), and the contributor is properly added to the list.
• No files require special attention

Important Files Changed

Filename	Overview
source/isaaclab/isaaclab/sensors/ray_caster/ray_caster.py	Updated comment to correctly describe that vertical drift is applied to hit positions, not ray starting positions
CONTRIBUTORS.md	Added Ang Li to contributors list in alphabetical order

Sequence Diagram

sequenceDiagram
    participant Caller
    participant RayCaster
    participant raycast_mesh
    participant Data

    Caller->>RayCaster: _update_buffers_impl(env_ids)
    RayCaster->>RayCaster: _update_ray_infos(env_ids)
    Note over RayCaster: Apply horizontal drift to<br/>ray starting positions
    RayCaster->>raycast_mesh: raycast_mesh(ray_starts, ray_directions, max_dist)
    raycast_mesh-->>RayCaster: ray_hits_w (hit positions)
    Note over RayCaster: [FIXED COMMENT]<br/>Apply vertical drift to<br/>z-coordinate of hit positions
    RayCaster->>Data: ray_hits_w[:, :, 2] += drift
    Note over Data: Final hit positions<br/>with vertical bias applied

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