Docstrings arguments cleanup (#3229)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

docs/reference/yolo/nas/model.md

@@ -3,7 +3,7 @@ description: Learn about the Neural Architecture Search (NAS) feature available
 keywords: Ultralytics YOLO, object detection, NAS, Neural Architecture Search, model optimization, accuracy improvement
 ---
 
-# NAS
+## NAS
 ---
-:::ultralytics.yolo.nas.model.NAS
+### ::: ultralytics.yolo.nas.model.NAS
 <br><br>

docs/reference/yolo/nas/predict.md

@@ -3,7 +3,7 @@ description: Learn how to use NASPredictor in Ultralytics YOLO for deploying eff
 keywords: Ultralytics YOLO, NASPredictor, neural architecture search, efficient CNN models, search algorithms
 ---
 
-# NASPredictor
+## NASPredictor
 ---
-:::ultralytics.yolo.nas.predict.NASPredictor
+### ::: ultralytics.yolo.nas.predict.NASPredictor
 <br><br>

docs/reference/yolo/nas/val.md

@@ -3,7 +3,7 @@ description: Learn about NASValidator in the Ultralytics YOLO Docs. Properly val
 keywords: NASValidator, YOLO, neural architecture search, validation, performance, Ultralytics
 ---
 
-# NASValidator
+## NASValidator
 ---
-:::ultralytics.yolo.nas.val.NASValidator
+### ::: ultralytics.yolo.nas.val.NASValidator
 <br><br>