fix docstring in bbox_nms.py (#7547)

* Create init_cfg.md

* Update docs/zh_cn/tutorials/init_cfg.md

Co-authored-by: Haian Huang(深度眸) <[email protected]>

* update init_cfg.md

* update init_cfg.md

* update init_cfg.md

* update init_cfg.md

* fix docstring

* fix docstring

Co-authored-by: Haian Huang(深度眸) <[email protected]>

Author: yarkable

mmdet/core/post_processing/bbox_nms.py

@@ -20,7 +20,7 @@ def multiclass_nms(multi_bboxes,
             contains scores of the background class, but this will be ignored.
         score_thr (float): bbox threshold, bboxes with scores lower than it
             will not be considered.
-        nms_thr (float): NMS IoU threshold
+        nms_cfg (dict): a dict that contains the arguments of nms operations
         max_num (int, optional): if there are more than max_num bboxes after
             NMS, only top max_num will be kept. Default to -1.
         score_factors (Tensor, optional): The factors multiplied to scores