docs: fix opt engine docs

Author: Alexey Stukalov

docs/make.jl

@@ -1,7 +1,14 @@
-using Documenter, StructuralEquationModels
+using Documenter, StructuralEquationModels, NLopt, ProximalAlgorithms, ProximalOperators
+
+SEM = StructuralEquationModels
+SEMNLOptExt = Base.get_extension(StructuralEquationModels, :SEMNLOptExt)
+SEMProximalOptExt = Base.get_extension(StructuralEquationModels, :SEMProximalOptExt)
 
 makedocs(
     sitename = "StructuralEquationModels.jl",
+    modules = [
+        SEM, SEMNLOptExt, SEMProximalOptExt,
+    ],
     pages = [
         "index.md",
         "Tutorials" => [

docs/src/tutorials/backends/nlopt.md

@@ -2,7 +2,7 @@
 
 When [`NLopt.jl`](https://github.com/jump-dev/NLopt.jl) is loaded in the running Julia session,
 it could be used by the [`SemOptimizer`](@ref) by specifying `engine = :NLopt`
-(see [NLopt-specific options](@ref `SemOptimizer(Val(:NLopt))`)).
+(see [NLopt-specific options](@ref SEMNLOptExt.SemOptimizerNLopt)).
 Among other things, `NLopt` enables constrained optimization of the SEM models, which is
 explained in the [Constrained optimization](@ref) section.
 

docs/src/tutorials/backends/optim.md

@@ -1,7 +1,7 @@
 # Using Optim.jl
 
-[Optim.jl](https://github.com/JuliaNLSolvers/Optim.jl) is the default optimization engine of *SEM.jl*,
-see [`SemOptimizer(Val(:Optim))`](@ref) for a full list of its parameters.
+[*Optim.jl*](https://github.com/JuliaNLSolvers/Optim.jl) is the default optimization engine of *SEM.jl*,
+see [`SEM.SemOptimizerOptim`](@ref) for a full list of its parameters.
 It defaults to the LBFGS optimization, but we can load the `Optim` and `LineSearches` packages
 and specify BFGS (!not L-BFGS) with a back-tracking linesearch and Hager-Zhang initial step length guess:
 

docs/src/tutorials/concept.md

@@ -100,18 +100,9 @@ SemConstant
 
 ## optimizer
 
-```@eval OptDocs
-using StructuralEquationModels, NLopt
-
-StructuralEquationModels.optimizer_engine_doc(:NLopt)
-```
-
-```@setup OptDocs
-using StructuralEquationModels, NLopt
-
-SemOptimizerNLopt = Base.get_extension(StructuralEquationModels, :SEMNLOptExt).SemOptimizerNLopt
-```
-
 ```@docs
 SemOptimizer
+SEM.SemOptimizerOptim
+SEMNLOptExt.SemOptimizerNLopt
+SEMProximalOptExt.SemOptimizerProximal
 ```