message: doc(deprecated) Restore the `call` example as close as possible.
diff: @@ -50,7 +50,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
  },
  })?;
  - let foo: Func<(), i32> = instance.exports.get("dbz")?;
  + let foo: Func<(), ()> = instance.exports.get("dbz")?;
  let result = foo.call();
  println!("result: {:?}", result.unwrap_err().message());
  