Fix typo

packages/flutter_tools/lib/src/commands/emulators.dart

@@ -73,7 +73,7 @@ class EmulatorsCommand extends FlutterCommand {
       }
     } else {
       printStatus(
-          '${emulators.length} available ${pluralize('emulators', emulators.length)}:\n');
+          '${emulators.length} available ${pluralize('emulator', emulators.length)}:\n');
       await Emulator.printEmulators(emulators);
     }
   }