remove file size check for sdk API (#3066)

### What problem does this PR solve?

### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [x] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

api/apps/sdk/doc.py

 from rag.utils.storage_factory import STORAGE_IMPL
 import os
 
-MAXIMUM_OF_UPLOADING_FILES = 256
-
-MAXIMUM_OF_UPLOADING_FILES = 256
-
-MAXIMUM_OF_UPLOADING_FILES = 256
-
-MAXIMUM_OF_UPLOADING_FILES = 256
-
 
 @manager.route('/datasets/<dataset_id>/documents', methods=['POST'])
 @token_required
         if file_obj.filename == '':
             return get_result(
                 retmsg='No file selected!', retcode=RetCode.ARGUMENT_ERROR)
-    # total size
-    total_size = 0
-    for file_obj in file_objs:
-        file_obj.seek(0, os.SEEK_END)
-        total_size += file_obj.tell()
-        file_obj.seek(0)
-    MAX_TOTAL_FILE_SIZE=10*1024*1024
-    if total_size > MAX_TOTAL_FILE_SIZE:
-        return get_result(
-            retmsg=f'Total file size exceeds 10MB limit! ({total_size / (1024 * 1024):.2f} MB)',
-            retcode=RetCode.ARGUMENT_ERROR)
+
     e, kb = KnowledgebaseService.get_by_id(dataset_id)
     if not e:
         raise LookupError(f"Can't find the dataset with ID {dataset_id}!")
-    err, files= FileService.upload_document(kb, file_objs, tenant_id)
+    err, files = FileService.upload_document(kb, file_objs, tenant_id)
     if err:
         return get_result(
             retmsg="\n".join(err), retcode=RetCode.SERVER_ERROR)

intergrations/chatgpt-on-wechat/plugins/README.md

 Before you can use this plugin, ensure the following are in place:
 
 1. You have installed and configured [ChatGPT-on-WeChat](https://github.com/zhayujie/chatgpt-on-wechat).
-2. You have deployed and are running the [RAGFlow](https://github.com/jina-ai/ragflow) server.
+2. You have deployed and are running the [RAGFlow](https://github.com/infiniflow/ragflow) server.
    
 Make sure both `config.json` files (ChatGPT-on-WeChat and RAGFlow Chat Plugin) are correctly set up as per the examples above.