docs(data_classes): fix missing dynamodb stream get_type/value

Author: heitorlessa

Diff for: docs/utilities/data_classes.md

@@ -556,21 +556,42 @@ attributes values (`AttributeValue`), as well as enums for stream view type (`St
 
 === "app.py"
 
-```python
-from aws_lambda_powertools.utilities.data_classes.dynamo_db_stream_event import (
-    DynamoDBStreamEvent,
-    DynamoDBRecordEventName
-)
-
-def lambda_handler(event, context):
-    event: DynamoDBStreamEvent = DynamoDBStreamEvent(event)
-
-    # Multiple records can be delivered in a single event
-    for record in event.records:
-        if record.event_name == DynamoDBRecordEventName.MODIFY:
-            do_something_with(record.dynamodb.new_image)
-            do_something_with(record.dynamodb.old_image)
-```
+	```python
+	from aws_lambda_powertools.utilities.data_classes.dynamo_db_stream_event import (
+		DynamoDBStreamEvent,
+		DynamoDBRecordEventName
+	)
+
+	def lambda_handler(event, context):
+		event: DynamoDBStreamEvent = DynamoDBStreamEvent(event)
+
+		# Multiple records can be delivered in a single event
+		for record in event.records:
+			if record.event_name == DynamoDBRecordEventName.MODIFY:
+				do_something_with(record.dynamodb.new_image)
+				do_something_with(record.dynamodb.old_image)
+	```
+
+=== "multiple_records_types.py"
+
+	```python
+	from aws_lambda_powertools.utilities.data_classes import event_source, DynamoDBStreamEvent
+	from aws_lambda_powertools.utilities.data_classes.dynamo_db_stream_event import AttributeValueType, AttributeValue
+	from aws_lambda_powertools.utilities.typing import LambdaContext
+
+
+	@event_source(data_class=DynamoDBStreamEvent)
+	def lambda_handler(event: DynamoDBStreamEvent, context: LambdaContext):
+		for record in event.records:
+			key: AttributeValue = record.dynamodb.keys["id"]
+			if key == AttributeValueType.Number:
+				# {"N": "123.45"} => "123.45"
+				assert key.get_value == key.n_value
+				print(key.get_value)
+			elif key == AttributeValueType.Map:
+				assert key.get_value == key.map_value
+				print(key.get_value)
+	```
 
 ### EventBridge