small doc corrections

Author: franckgaga

src/controller/nonlinmpc.jl

@@ -144,7 +144,7 @@ default arguments.
 
 !!! warning
     See Extended Help if you get an error like `MethodError: no method matching 
-    Float64(::ForwardDiff.Dual)`
+    Float64(::ForwardDiff.Dual)`.
 
 # Arguments
 - `model::SimModel` : model used for controller predictions and state estimations.

src/model/nonlinmodel.jl

@@ -43,7 +43,7 @@ Nonlinear continuous-time state-space functions are not supported for now. In su
 manually call a differential equation solver in the `f` function (e.g.: Euler method).
 
 !!! warning
-    The `f` and `h` must be pure Julia functions to use the model in [`NonLinMPC`](@ref).
+    `f` and `h` must be pure Julia functions to use the model in [`NonLinMPC`](@ref).
 
 See also [`LinModel`](@ref).