docs: update to docs for Solver Settings Objects (#3580)

* no newline in report_definitions and replace root

* replace last root

* replace zone_names

doc/source/user_guide/solver_settings/index.rst

@@ -244,28 +244,22 @@ These examples accesses the list of zone surfaces:
 
 .. code-block::
 
-  >>> root.solution.report_definitions.flux["mass_flow_rate"] = {}
-  >>> root.solution.report_definitions.flux[
-          "mass_flow_rate"
-      ].zone_names.allowed_values()
+  >>> solver.settings.solution.report_definitions.flux["mass_flow_rate"] = {}
+  >>> solver.settings.solution.report_definitions.flux["mass_flow_rate"].boundaries.allowed_values()
   ['symmetry-xyplane', 'hot-inlet', 'cold-inlet', 'outlet', 'wall-inlet', 'wall-elbow', 'interior--elbow-fluid']
 
 
 .. code-block::
 
-  >>> root.solution.report_definitions.flux["mass_flow_rate"] = {}
-  >>> root.solution.report_definitions.flux[
-          "mass_flow_rate"
-      ].zone_names.get_attr("allowed-values")
+  >>> solver.settings.solution.report_definitions.flux["mass_flow_rate"] = {}
+  >>> solver.settings.solution.report_definitions.flux["mass_flow_rate"].boundaries.get_attr("allowed-values")
   ['symmetry-xyplane', 'hot-inlet', 'cold-inlet', 'outlet', 'wall-inlet', 'wall-elbow', 'interior--elbow-fluid']
 
 
 .. code-block::
 
-  >>> root.solution.report_definitions.flux["mass_flow_rate"] = {}
-  >>> root.solution.report_definitions.flux[
-          "mass_flow_rate"
-      ].zone_names.get_attrs(["allowed-values"])
+  >>> solver.settings.solution.report_definitions.flux["mass_flow_rate"] = {}
+  >>> solver.settings.solution.report_definitions.flux["mass_flow_rate"].boundaries.get_attrs(["allowed-values"])
   {'allowed-values': ['symmetry-xyplane', 'hot-inlet', 'cold-inlet', 'outlet', 'wall-inlet', 'wall-elbow', 'interior--elbow-fluid']}