Update indigo documentation to melodic (#540)

Author: DLu

doc/motion_planning_api/src/motion_planning_api_tutorial.cpp

@@ -69,7 +69,7 @@ int main(int argc, char** argv)
   // to use.
   //
   // .. _RobotModelLoader:
-  //     http://docs.ros.org/indigo/api/moveit_ros_planning/html/classrobot__model__loader_1_1RobotModelLoader.html
+  //     http://docs.ros.org/melodic/api/moveit_ros_planning/html/classrobot__model__loader_1_1RobotModelLoader.html
   const std::string PLANNING_GROUP = "panda_arm";
   robot_model_loader::RobotModelLoader robot_model_loader("robot_description");
   robot_model::RobotModelPtr robot_model = robot_model_loader.getModel();
@@ -173,7 +173,7 @@ int main(int argc, char** argv)
   // package.
   //
   // .. _kinematic_constraints:
-  //     http://docs.ros.org/indigo/api/moveit_core/html/namespacekinematic__constraints.html#a88becba14be9ced36fefc7980271e132
+  //     http://docs.ros.org/melodic/api/moveit_core/html/namespacekinematic__constraints.html#a88becba14be9ced36fefc7980271e132
   moveit_msgs::Constraints pose_goal =
       kinematic_constraints::constructGoalConstraints("panda_link8", pose, tolerance_pose, tolerance_angle);
 

doc/motion_planning_pipeline/src/motion_planning_pipeline_tutorial.cpp

@@ -63,7 +63,7 @@ int main(int argc, char** argv)
   // parameter server and construct a :moveit_core:`RobotModel` for us to use.
   //
   // .. _RobotModelLoader:
-  //     http://docs.ros.org/indigo/api/moveit_ros_planning/html/classrobot__model__loader_1_1RobotModelLoader.html
+  //     http://docs.ros.org/melodic/api/moveit_ros_planning/html/classrobot__model__loader_1_1RobotModelLoader.html
   robot_model_loader::RobotModelLoader robot_model_loader("robot_description");
   robot_model::RobotModelPtr robot_model = robot_model_loader.getModel();
 
@@ -130,7 +130,7 @@ int main(int argc, char** argv)
   // package.
   //
   // .. _kinematic_constraints:
-  //     http://docs.ros.org/indigo/api/moveit_core/html/namespacekinematic__constraints.html#a88becba14be9ced36fefc7980271e132
+  //     http://docs.ros.org/melodic/api/moveit_core/html/namespacekinematic__constraints.html#a88becba14be9ced36fefc7980271e132
   req.group_name = "panda_arm";
   moveit_msgs::Constraints pose_goal =
       kinematic_constraints::constructGoalConstraints("panda_link8", pose, tolerance_pose, tolerance_angle);

doc/move_group_interface/move_group_interface_tutorial.rst

@@ -3,7 +3,7 @@ Move Group C++ Interface
 .. image:: move_group_interface_tutorial_start_screen.png
    :width: 700px
 
-In MoveIt, the simplest user interface is through the :move_group_interface:`MoveGroupInterface` class. It provides easy to use functionality for most operations that a user may want to carry out, specifically setting joint or pose goals, creating motion plans, moving the robot, adding objects into the environment and attaching/detaching objects from the robot. This interface communicates over ROS topics, services, and actions to the `MoveGroup Node <http://docs.ros.org/indigo/api/moveit_ros_move_group/html/annotated.html>`_.
+In MoveIt, the simplest user interface is through the :move_group_interface:`MoveGroupInterface` class. It provides easy to use functionality for most operations that a user may want to carry out, specifically setting joint or pose goals, creating motion plans, moving the robot, adding objects into the environment and attaching/detaching objects from the robot. This interface communicates over ROS topics, services, and actions to the `MoveGroup Node <http://docs.ros.org/melodic/api/moveit_ros_move_group/html/annotated.html>`_.
 
 
 Watch this quick `YouTube video demo <https://youtu.be/_5siHkFQPBQ>`_ to see the power of the move group interface!