fix: endpoint_url parameter syntax

Signed-off-by: heitorlessa <[email protected]>

Author: heitorlessa

docs/utilities/parameters.md

@@ -204,7 +204,7 @@ You can initialize the DynamoDB provider pointing to [DynamoDB Local](https://do
 	```python hl_lines="3"
 	from aws_lambda_powertools.utilities import parameters
 
-	dynamodb_provider = parameters.DynamoDBProvider(table_name="my-table", endpoint_url: "http://localhost:8000")
+	dynamodb_provider = parameters.DynamoDBProvider(table_name="my-table", endpoint_url="http://localhost:8000")
 	```
 
 **DynamoDB table structure for single parameters**