Clean up duplicate readme entry

Author: stephane-caron

README.md

@@ -162,7 +162,6 @@ The DOF column denotes the number of actuated degrees of freedom.
 | `xarm7_mj_description`        | xArm7                 | UFACTORY                 | MJCF       | BSD-3-Clause |
 | `yam_description`             | YAM                   | I2RT Robotics            | URDF       | MIT          |
 | `yam_mj_description`          | YAM                   | I2RT Robotics            | MJCF       | MIT          |
-| `yam_description`             | YAM                   | I2RT Robotics            | URDF       | MIT          |
 | `z1_description`              | Z1                    | UNITREE Robotics         | URDF       | BSD-3-Clause |
 | `z1_mj_description`           | Z1                    | UNITREE Robotics         | MJCF       | BSD-3-Clause |