8193819: Error message when module does not have a ModuleMainClass attribute is confusing

Reviewed-by: sundar

src/java.base/share/classes/sun/launcher/resources/launcher.properties

@@ -220,7 +220,7 @@ java.launcher.javafx.error1=\
     Error: The JavaFX launchApplication method has the wrong signature, it\n\
     must be declared static and return a value of type void
 java.launcher.module.error1=\
-    module {0} does not have a MainClass attribute, use -m <module>/<main-class>
+    module {0} does not have a ModuleMainClass attribute, use -m <module>/<main-class>
 java.launcher.module.error2=\
     Error: Could not find or load main class {0} in module {1}
 java.launcher.module.error3=\