docs(event_handler): fix typing in micro function example (#3098)

Author: leandrodamascena

docs/core/event_handler/api_gateway.md

@@ -883,8 +883,10 @@ Each endpoint will be it's own Lambda function that is configured as a [Lambda i
     --8<-- "examples/event_handler_rest/sam/micro_function_template.yaml"
     ```
 
+<!-- markdownlint-disable MD013 -->
 ???+ note
-    You can see some of the downsides in this example such as some code reuse. If set up with proper build tooling, the `User` class could be shared across functions. This could be accomplished by packaging shared code as a Lambda Layer.
+    You can see some of the downsides in this example such as some code reuse. If set up with proper build tooling, the `User` class could be shared across functions. This could be accomplished by packaging shared code as a [Lambda Layer](https://docs.aws.amazon.com/lambda/latest/dg/chapter-layers.html){target="_blank"} or [Pants](https://www.pantsbuild.org/docs/awslambda-python){target="_blank" rel="nofollow"}.
+<!-- markdownlint-enable MD013 -->
 
 ## Testing your code
 

examples/event_handler_rest/src/micro_function_user_by_id_route.py

@@ -1,6 +1,7 @@
 import json
 from dataclasses import dataclass
 from http import HTTPStatus
+from typing import Union
 
 from aws_lambda_powertools import Logger
 from aws_lambda_powertools.event_handler import APIGatewayRestResolver, Response
@@ -43,7 +44,7 @@ def get_user_by_id(user_id: str) -> Union[User, None]:
                 email=str(user_data["email"]),
                 active=bool(user_data["active"]),
             )
-            
+
     return None