The example should output "Hello from Rust!" (#1931)

* Make console output "Hello from Rust!"

The HTML says the console would output Hello from Rust!, but instead it outputs Hello, World!
This is a proposed fix.

* Output "Hello from Rust!"

The HTML says the console would output "Hello from Rust!" but instead it outputs "Hello, World!".
This is a proposed fix.

examples/import_js/crate/defined-in-js.js

@@ -1,5 +1,5 @@
 export function name() {
-    return 'World';
+    return 'Rust';
 }
 
 export class MyClass {