Update MainGenericRunner deprecation message for removal in 3.8.0

Author: Gedochao

compiler/src/dotty/tools/MainGenericRunner.scala

@@ -273,12 +273,11 @@ object MainGenericRunner {
     val silenced = sys.props.get("scala.use_legacy_launcher") == Some("true")
 
     if !silenced then
-      Console.err.println(s"[warning] MainGenericRunner class is deprecated since Scala 3.5.0, and Scala CLI features will not work.")
-      Console.err.println(s"[warning] Please be sure to update to the Scala CLI launcher to use the new features.")
+      Console.err.println(s"[warning] The MainGenericRunner class and 'legacy_scala' command have been deprecated for removal in Scala 3.8.0.")
+      Console.err.println(s"[warning] Please be sure to migrate to the scala command (Scala CLI).")
       if ranByCoursierBootstrap then
         Console.err.println(s"[warning] It appears that your Coursier-based Scala installation is misconfigured.")
         Console.err.println(s"[warning] To update to the new Scala CLI runner, please update (coursier, cs) commands first before re-installing scala.")
-      Console.err.println(s"[warning] Check the Scala 3.5.0 release notes to troubleshoot your installation.")
 
 
     run(settings) match