[web] Update web runner message with flutter.dev/web (#42676)

* Update web runner message with flutter.dev/web

* Update spoopy test to use Warning instead

packages/flutter_tools/lib/src/build_runner/resident_web_runner.dart

@@ -126,11 +126,9 @@ class ResidentWebRunner extends ResidentRunner {
       fire + terminal.bolden(rawMessage),
       TerminalColor.red,
     );
-    const String warning = '👻 ';
-    printStatus(warning * 20);
-    printStatus('Warning: Flutter\'s support for building web applications is highly experimental.');
-    printStatus('For more information see https://github.com/flutter/flutter/issues/34082.');
-    printStatus(warning * 20);
+    printStatus('Warning: Flutter\'s support for web development is not stable yet and hasn\'t');
+    printStatus('been thoroughly tested in production environments.');
+    printStatus('For more information see https://flutter.dev/web.');
     printStatus('');
     printStatus(message);
     const String quitMessage = 'To quit, press "q".';

packages/flutter_tools/test/general.shard/resident_web_runner_test.dart

@@ -296,11 +296,11 @@ void main() {
     expect(result.message, contains('Page requires refresh'));
   }));
 
-  test('printHelp without details is spoopy', () => testbed.run(() async {
+  test('printHelp without details has web warning', () => testbed.run(() async {
     residentWebRunner.printHelp(details: false);
     final BufferLogger bufferLogger = logger;
 
-    expect(bufferLogger.statusText, contains('👻'));
+    expect(bufferLogger.statusText, contains('Warning'));
   }));
 
   test('debugDumpApp', () => testbed.run(() async {