Update prefer_final_parameters comment (#125465)

Per discusion in flutter/flutter#125061.

Author: goderbauer

analysis_options.yaml

@@ -154,7 +154,7 @@ linter:
     - prefer_final_fields
     - prefer_final_in_for_each
     - prefer_final_locals
-    # - prefer_final_parameters # we should enable this one day when it can be auto-fixed (https://github.com/dart-lang/linter/issues/3104), see also parameter_assignments
+    # - prefer_final_parameters # adds too much verbosity
     - prefer_for_elements_to_map_fromIterable
     - prefer_foreach
     - prefer_function_declarations_over_variables