Add docstrings and improve comments (#11229)

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

docs/en/integrations/amazon-sagemaker.md

@@ -118,6 +118,7 @@ After creating the AWS CloudFormation Stack, the next step is to deploy YOLOv8.
 import json
 
 def output_fn(prediction_output, content_type):
+    """Formats model outputs as JSON string according to content_type, extracting attributes like boxes, masks, keypoints."""
     print("Executing output_fn from inference.py ...")
     infer = {}
     for result in prediction_output: