Update ur_controllers/doc/index.rst

add UR8 Long

Co-authored-by: Felix Exner <[email protected]>

Author: URJala

ur_controllers/doc/index.rst

@@ -107,7 +107,7 @@ previous control cycle.
 Using velocity as command interface
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 The controller is able to use velocity as the sole command interface, and gains for that control mode have been specified, that work with all e-series robots.
-The UR15, UR20 and UR30 robot models, however, do not support this control mode.
+The UR8 Long, UR15, UR20 and UR30 robot models, however, do not support this control mode.
 
 .. _io_and_status_controller: