Added joint_mobile_base_translation to the joint limits list.

follow_joint_trajectory.md

@@ -301,6 +301,7 @@ joint_wrist_yaw: lower_limit = -1.75,  upper_limit =  4.00  # in radians
 joint_head_pan:  lower_limit = -2.80,  upper_limit =  2.90  # in radians
 joint_head_tilt: lower_limit = -1.60,  upper_limit =  0.40  # in radians
 joint_gripper_finger_left:  lower_limit = -0.35,  upper_limit =  0.165  # in radians
+joint_mobile_base_translation: lower_limit = -0.50, upper_limit = 0.50  # in radians
 ########################################################################
 ```