[pyupgrade] Make example error out-of-the-box (UP046) (#19295)

crates/ruff_linter/src/rules/pyupgrade/rules/pep695/non_pep695_generic_class.rs

@@ -43,7 +43,7 @@ use super::{
 /// ## Example
 ///
 /// ```python
-/// from typing import TypeVar
+/// from typing import Generic, TypeVar
 ///
 /// T = TypeVar("T")
 ///