minor doc correction

Author: franckgaga

src/predictive_control.jl

@@ -341,8 +341,8 @@ setstate!(mpc::PredictiveController, x̂) = (setstate!(mpc.estim, x̂); return m
 Init `mpc.ΔŨ` for warm-starting and the states of `mpc.estim` [`StateEstimator`](@ref).
 
 Before calling [`initstate!(::StateEstimator,_,_)`](@ref), it warm-starts ``\mathbf{ΔŨ}``:
-- If `model` is a [`LinModel`], the vector is filled with the analytical minimum ``J`` of
-  the unconstrained problem.
+- If `model` is a [`LinModel`](ref), the vector is filled with the analytical minimum ``J``
+  of the unconstrained problem.
 - Else, the vector is filled with zeros.
 """
 function initstate!(mpc::PredictiveController, u, ym, d=Float64[])