Revert to correct JSOSolvers 0.11 API

The previous changes attempted to use `subsolver = :symbol` API which doesn't exist in JSOSolvers 0.11.
Testing confirmed that JSOSolvers 0.11 uses `subsolver_type = Type` (e.g., CglsSolver, LsmrSolver).
This commit reverts to the correct working API that is compatible with JSOSolvers 0.11.2.

Author: arnavk23

tutorials/advanced-jsosolvers/index.jmd

@@ -8,6 +8,8 @@ author: "Tangi Migot"
 
 This tutorial showcases some advanced features of solvers in JSOSolvers.
 
+**Note**: This tutorial is compatible with JSOSolvers 0.11. The subsolver is selected using the `subsolver_type` parameter with Krylov solver types (e.g., `CglsSolver`, `LsmrSolver`).
+
 ```julia
 using JSOSolvers
 ```
@@ -51,34 +53,29 @@ For detailed descriptions of each subsolver's algorithm and when to use it, see
 using Krylov
 ```
 
-For example, to call TRUNK with an explicit subsolver and tolerances:
-
-```julia
-stats = trunk(nls; subsolver = :cgls)
-```
 We define a dictionary of the different solvers that will be benchmarked.
 We consider here four variants of TRUNK using the different subsolvers.
 
-The same subsolver selection pattern applies to TRON’s least-squares specialization:
+For example, to call TRUNK with an explicit subsolver:
 
 ```julia
-stats_tron = tron(nls; subsolver = :lsmr, rtol = RTOL, atol = ATOL, max_time = max_time)
+stats = trunk(nls, subsolver_type = CglsSolver)
 ```
 
+The same subsolver selection pattern applies to TRON's least-squares specialization:
+
 ```julia
-solvers = Dict(
-    :trunk_cgls => nlp -> trunk(nlp; subsolver = :cgls),
-    :trunk_crls => nlp -> trunk(nlp; subsolver = :crls),
-    :trunk_lsqr => nlp -> trunk(nlp; subsolver = :lsqr),
-    :trunk_lsmr => nlp -> trunk(nlp; subsolver = :lsmr)
-)
+stats_tron = tron(nls, subsolver_type = LsmrSolver)
 ```
 
+Now we define the solver dictionary for benchmarking:
+
 ```julia
-RTOL = 1e-6; ATOL = 1e-8; max_time = 60.0
 solvers = Dict(
-    :trunkls_lsmr => nlp -> trunk(nlp; rtol = RTOL, atol = ATOL, subsolver = :lsmr, max_time = max_time),
-    :trunkls_cg   => nlp -> trunk(nlp; rtol = RTOL, atol = ATOL, subsolver = :cg,   max_time = max_time),
+  :trunk_cgls => model -> trunk(model, subsolver_type = CglsSolver),
+  :trunk_crls => model -> trunk(model, subsolver_type = CrlsSolver),
+  :trunk_lsqr => model -> trunk(model, subsolver_type = LsqrSolver),
+  :trunk_lsmr => model -> trunk(model, subsolver_type = LsmrSolver)
 )
 ```