Fix comment in test file

Author: Felix Exner

ur_robot_driver/test/robot_driver.py

@@ -277,7 +277,8 @@ def test_trajectory(self):
         self.node.get_logger().info("Received result SUCCESSFUL")
 
     def test_illegal_trajectory(self):
-        """Test trajectory server.
+        """
+        Test trajectory server.
 
         This is more of a validation test that the testing suite does the right thing
         """