ultralytics 8.0.97 confusion matrix, windows, docs updates (#2511)

Co-authored-by: Yonghye Kwon <developer.0hye@gmail.com>
Co-authored-by: Dowon <ks2515@naver.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Laughing <61612323+Laughing-q@users.noreply.github.com>

ultralytics/yolo/utils/files.py

@@ -49,7 +49,7 @@ def increment_path(path, exist_ok=False, sep='', mkdir=False):
 
         # Method 1
         for n in range(2, 9999):
-            p = f'{path}{sep}{n}{suffix}'  # increment path
+            p = f'{path}{sep}{str(n).zfill(4)}{suffix}'  # increment path
             if not os.path.exists(p):  #
                 break
         path = Path(p)