Remove deprecated gripper_controller (#1652)

Author: christophfroehlich

doc/controllers_index.rst

@@ -51,7 +51,6 @@ The controllers are using `common hardware interface definitions`_, and may use
    Admittance Controller <../admittance_controller/doc/userdoc.rst>
    Effort Controllers <../effort_controllers/doc/userdoc.rst>
    Forward Command Controller <../forward_command_controller/doc/userdoc.rst>
-   Gripper Controller <../gripper_controllers/doc/userdoc.rst>
    Joint Trajectory Controller <../joint_trajectory_controller/doc/userdoc.rst>
    Parallel Gripper Controller <../parallel_gripper_controller/doc/userdoc.rst>
    PID Controller <../pid_controller/doc/userdoc.rst>

doc/migration.rst

@@ -4,6 +4,10 @@ Migration Guides: Jazzy to Kilted
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 This list summarizes important changes between Jazzy (previous) and Kilted (current) releases, where changes to user code might be necessary.
 
+GripperActionController
+*****************************
+The ``effort_controllers/GripperActionController`` and ``position_controllers/GripperActionController`` have been removed. The ``parallel_gripper_action_controller/GripperActionController`` should be used instead. `(#1652 <https://github.com/ros-controls/ros2_controllers/pull/1652>`__).
+
 diff_drive_controller
 *****************************
 * Parameters ``has_velocity_limits``, ``has_acceleration_limits``, and ``has_jerk_limits`` are removed. Instead, set the respective limits to ``.NAN``. (`#1653 <https://github.com/ros-controls/ros2_controllers/pull/1653>`_).