[flake8-annotations] Make ANN401 example error out-of-the-box (#18974)

Author: MeGaGiGaGon

crates/ruff_linter/src/rules/flake8_annotations/rules/definition.rs

@@ -476,12 +476,18 @@ impl Violation for MissingReturnTypeClassMethod {
 /// ## Example
 ///
 /// ```python
+/// from typing import Any
+///
+///
 /// def foo(x: Any): ...
 /// ```
 ///
 /// Use instead:
 ///
 /// ```python
+/// from typing import Any
+///
+///
 /// def foo(x: int): ...
 /// ```
 ///