[doc] Remove Controllers which is redundant with Available Controllers (

ros-controls#456)

doc/controllers_index.rst

@@ -20,18 +20,10 @@ The controllers' namespaces are commanding the following command interface types
   - ``effort_controllers``: ``hardware_interface::HW_IF_EFFORT``
   - ...
 
-
-Controllers
-***********
-
-The following standard controllers are implemented:
-
-  - `Joint Trajectory Controller <joint_trajectory_controller/docs/index.rst>`_ - provided a list of waypoints or target point defined with position, velocity and acceleration, the controller interpolates joint trajectories through it.
-  - ... <the list is not complete> ...
-
 .. _common hardware interface definitions: https://github.com/ros-controls/ros2_control/blob/master/hardware_interface/include/hardware_interface/types/hardware_interface_type_values.hpp
 
 
+
 Guidelines and Best Practices
 *****************************
 
@@ -43,7 +35,7 @@ Guidelines and Best Practices
 
 
 Available Controllers
-=====================
+*********************
 
 .. toctree::
    :titlesonly:
@@ -57,7 +49,7 @@ Available Controllers
 
 
 Available Broadcasters
-======================
+**********************
 
 .. toctree::
    :titlesonly: