docs: remove Logger dependency on retrieval to address Simon's feedback

Author: heitorlessa

docs/core/event_handler/api_gateway.md

@@ -406,7 +406,7 @@ Here's a sample middleware that extracts and injects correlation ID, using `APIG
     ```
 
     1. You can access current request like you normally would.
-    2. [Shared context is available](#sharing-contextual-data) to any middleware, Router and App instances.
+    2. [Shared context is available](#sharing-contextual-data) to any middleware, Router and App instances. <br><br> For example, another middleware can now use `app.context.get("correlation_id")` to retrieve it.
     3. Get response from the next middleware (if any) or from `/todos` route.
     4. You can manipulate headers, body, or status code before returning it.
     5. Register one or more middlewares in order of execution.

examples/event_handler_rest/src/middleware_getting_started.py

@@ -12,7 +12,7 @@ def inject_correlation_id(app: APIGatewayRestResolver, next_middleware: NextMidd
     request_id = app.current_event.request_context.request_id  # (1)!
 
     # Use API Gateway REST API request ID if caller didn't include a correlation ID
-    correlation_id = logger.get_correlation_id() or request_id
+    correlation_id = app.context.get("correlation_id") or request_id
 
     # Inject correlation ID in shared context and Logger
     app.append_context(correlation_id=correlation_id)  # (2)!

examples/event_handler_rest/src/middleware_global_middlewares_module.py

@@ -18,7 +18,7 @@ def inject_correlation_id(app: APIGatewayRestResolver, next_middleware: NextMidd
     request_id = app.current_event.request_context.request_id
 
     # Use API Gateway REST API request ID if caller didn't include a correlation ID
-    correlation_id = logger.get_correlation_id() or request_id
+    correlation_id = app.context.get("correlation_id") or request_id
 
     # Inject correlation ID in shared context and Logger
     app.append_context(correlation_id=correlation_id)