Manual: minor improvements to description of solve_algo={1,2,9}

[skip ci]

doc/manual/source/the-model-file.rst

@@ -2944,13 +2944,12 @@ Finding the steady state with Dynare nonlinear solver
            ``1``
-                Use Dynare’s own nonlinear equation solver (a
-                Newton-like algorithm with line-search).
+                Use a Newton-like algorithm with line-search.
            ``2``
                 Splits the model into recursive blocks and solves each
-                block in turn using the same solver as value 1.
+                block in turn using the same solver as value ``1``.
            ``3``
@@ -2988,7 +2987,8 @@ Finding the steady state with Dynare nonlinear solver
            ``9``
-                Trust-region algorithm on the entire model.
+                Trust-region algorithm with autoscaling (same as value ``4``,
+                but applied to the entire model, without splitting).
            ``10``