fix(event_handler): docs snippets, high-level import CorsConfig (#1019)

Author: Michael Brewer

Diff for: aws_lambda_powertools/event_handler/__init__.py

@@ -2,7 +2,14 @@
 Event handler decorators for common Lambda events
 """
 
-from .api_gateway import ALBResolver, APIGatewayHttpResolver, ApiGatewayResolver, APIGatewayRestResolver
+from .api_gateway import ALBResolver, APIGatewayHttpResolver, ApiGatewayResolver, APIGatewayRestResolver, CORSConfig
 from .appsync import AppSyncResolver
 
-__all__ = ["AppSyncResolver", "APIGatewayRestResolver", "APIGatewayHttpResolver", "ALBResolver", "ApiGatewayResolver"]
+__all__ = [
+    "AppSyncResolver",
+    "APIGatewayRestResolver",
+    "APIGatewayHttpResolver",
+    "ALBResolver",
+    "ApiGatewayResolver",
+    "CORSConfig",
+]

Diff for: docs/core/event_handler/api_gateway.md

@@ -537,7 +537,7 @@ You can use **`exception_handler`** decorator with any Python exception. This al
 from aws_lambda_powertools import Logger, Tracer
 from aws_lambda_powertools.logging import correlation_paths
 from aws_lambda_powertools.event_handler import content_types
-from aws_lambda_powertools.event_handler import APIGatewayRestResolver, Response
+from aws_lambda_powertools.event_handler.api_gateway import APIGatewayRestResolver, Response
 
 tracer = Tracer()
 logger = Logger()
@@ -685,7 +685,7 @@ This will ensure that CORS headers are always returned as part of the response w
     ```python hl_lines="9 11"
     from aws_lambda_powertools import Logger, Tracer
     from aws_lambda_powertools.logging import correlation_paths
-    from aws_lambda_powertools.event_handler import APIGatewayRestResolver, CORSConfig
+    from aws_lambda_powertools.event_handler.api_gateway import APIGatewayRestResolver, CORSConfig
 
     tracer = Tracer()
     logger = Logger()