chore: Remove misleading comment in examples' hello_world.rs test (#3214)

Remove invalid comment, at the very least.

Closes #1617

Author: abernix

examples/hello-world/rust/src/hello_world.rs

@@ -82,8 +82,6 @@ register_plugin!("example", "hello_world", HelloWorld);
 
 #[cfg(test)]
 mod tests {
-    // If we run this test as follows: cargo test -- --nocapture
-    // we will see the message "Hello Bob" printed to standard out
     #[tokio::test]
     async fn display_message() {
         let config = serde_json::json!({