Fix: Revert doc changes (already merged in PR #1712) to fix CI duplicate errors

Signed-off-by: nitin2606 <[email protected]>

Author: nitin2606

doc/controllers_index.rst

@@ -32,7 +32,6 @@ Controllers for Wheeled Mobile Robots
    Omni Wheel Drive Controller <../omni_wheel_drive_controller/doc/userdoc.rst>
    Steering Controllers Library <../steering_controllers_library/doc/userdoc.rst>
    Tricycle Controller <../tricycle_controller/doc/userdoc.rst>
-   Swerve Drive Controller <../swerve_drive_controller/doc/userdoc.rst>
 
 Controllers for Manipulators and Other Robots
 *********************************************