doc: debug doctests

Author: franckgaga

src/estimator/execute.jl

@@ -107,6 +107,8 @@ julia> u = [1]; y = [3 - 0.1]; x̂ = round.(initstate!(estim, u, y), digits=3)
   0.0
  -0.1
 
+julia> preparestate!(estim, y); 
+
 julia> x̂ ≈ updatestate!(estim, u, y)
 true
 

src/estimator/mhe/execute.jl

@@ -126,7 +126,9 @@ dictionary `info` with the following fields:
 
 # Examples
 ```jldoctest
-julia> estim = MovingHorizonEstimator(LinModel(ss(1.0, 1.0, 1.0, 0, 1)), He=1, nint_ym=0);
+julia> model = LinModel(ss(1.0, 1.0, 1.0, 0, 5.0));
+
+julia> estim = MovingHorizonEstimator(model, He=1, nint_ym=0, direct=false);
 
 julia> updatestate!(estim, [0], [1]);