Update copter/source/docs/traditional-helicopter-tailrotor-setup.rst

Co-authored-by: Henry Wurzburg <[email protected]>

copter/source/docs/traditional-helicopter-tailrotor-setup.rst

@@ -24,7 +24,7 @@ Direct Drive Fixed Pitch
 
 The Direct Drive Fixed Pitch (DDFP) tail type accommodates two options: one where the main rotor rotates clockwise when viewed from above and the other where the main rotor rotates counter-clockwise when viewed from above.  Be sure to select the DDFP tail type for the main rotor rotation.  In this case, the control of tailrotor thrust is accomplished through tailrotor speed since it is a fixed pitch propeller. In the Heli Page of the Mission Planner Setup Tab, motor 4 is assigned to the servo number that corresponds to the servo channel the tailrotor ESC is physically connected.
 
-From version 4.5 and onward, DDFP tails now have access to thrust linearisation and voltage scaling. These features are off by default. The parameters used to setup these features can be found with the prefix  ``H_DDRP_x``.  Configuration of these features is exactly the same as thrust linearisation for multicopter, details for which can be found :ref:`motor-thrust-scaling<here>`.
+From version 4.5 and onward, DDFP tails now have access to thrust linearisation and voltage scaling. These features are off by default. The parameters used to setup these features can be found with the prefix  ``H_DDRP_x``.  Configuration of these features is exactly the same as thrust linearisation for multicopter, details for which can be found: ref:`here<motor-thrust-scaling>`.
 
 Direct Drive Variable Pitch
 +++++++++++++++++++++++++++