Fix link formatting for check_file_exist function (#3315)

fix: correct class name in zh_cn api_reference docs

Author: nximish

docs/zh_cn/get_started/api_reference.md

@@ -263,7 +263,7 @@
 | mmcv.utils.parrots_wrapper.SyncBatchNorm               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/parrots_wrapper.py | mmengine.utils.dl_utils.parrots_wrapper.SyncBatchNorm               | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/dl_utils/parrots_wrapper.py |
 | mmcv.utils.path.is_filepath                            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/path.py            | mmengine.utils.path.is_filepath                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/path.py                     |
 | mmcv.utils.path.fopen                                  | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/path.py            | mmengine.utils.path.fopen                                           | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/path.py                     |
-| mmcv.utils.path.check_file_exist                       | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/path.py            | mmengine.path.check_file_exist                                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/path.py                     |
+| mmcv.utils.path.check_file_exist                       | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/path.py            | mmengine.utils.path.check_file_exist                                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/path.py                     |
 | mmcv.utils.path.mkdir_or_exist                         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/path.py            | mmengine.utils.path.mkdir_or_exist                                  | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/path.py                     |
 | mmcv.utils.path.symlink                                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/path.py            | mmengine.utils.path.symlink                                         | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/path.py                     |
 | mmcv.utils.path.scandir                                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/path.py            | mmengine.utils.path.scandir                                         | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/path.py                     |