Merge pull request #36 from JuliaControl/doc_correction

minor doc correction

Author: franckgaga

src/estimator/execute.jl

@@ -26,8 +26,8 @@ function returns the next state of the augmented model, defined as:
     \mathbf{x̂}(k+1) &= \mathbf{f̂}\Big(\mathbf{x̂}(k), \mathbf{u}(k), \mathbf{d}(k)\Big) \\
     \mathbf{ŷ}(k)   &= \mathbf{ĥ}\Big(\mathbf{x̂}(k), \mathbf{d}(k)\Big) 
 \end{aligned}
-where ``\mathbf{x̂}(k+1)`` is stored in `x̂next` argument.
 ```
+where ``\mathbf{x̂}(k+1)`` is stored in `x̂next` argument.
 """
 function f̂!(x̂next, estim::StateEstimator, model::SimModel, x̂, u, d)
     # `@views` macro avoid copies with matrix slice operator e.g. [a:b]

src/model/nonlinmodel.jl

@@ -35,7 +35,7 @@ The state update ``\mathbf{f}`` and output ``\mathbf{h}`` functions are defined
     \mathbf{y}(k)   &= \mathbf{h}\Big( \mathbf{x}(k), \mathbf{d}(k) \Big)
     \end{aligned}
 ```
-They can be implemented in two possible ways:
+Denoting ``\mathbf{x}(k+1)`` as `xnext`, they can be implemented in two possible ways:
 
 - non-mutating functions (out-of-place): they must be defined as `f(x, u, d) -> xnext` and
   `h(x, d) -> y`. This syntax is simple and intuitive but it allocates more memory.