bugfix in doc comment code
@@ -256,7 +256,7 @@ impl private::ValueInternal for JsUndefined {
/// .call_method_with(&mut cx, "log")?
/// .arg(cx.null())
/// .exec(&mut cx)?;
-/// # Ok(null)
+/// # Ok(cx.null())
/// # }
/// ```
#[derive(Debug)]
