doc: new signature for initpred!

Author: franckgaga

docs/src/internals/predictive_control.md

@@ -30,7 +30,7 @@ ModelPredictiveControl.get_nonlinops(::NonLinMPC, ::ModelPredictiveControl.Gener
 ## Update Quadratic Optimization
 
 ```@docs
-ModelPredictiveControl.initpred!(::PredictiveController, ::LinModel, ::Any, ::Any, ::Any, ::Any)
+ModelPredictiveControl.initpred!(::PredictiveController, ::LinModel, ::Any, ::Any, ::Any, ::Any, ::Any)
 ModelPredictiveControl.linconstraint!(::PredictiveController, ::LinModel, ::TranscriptionMethod)
 ModelPredictiveControl.linconstrainteq!
 ```