Update description for knowledgebase_ids in Chat API

Author: antalike

content/cn/api_docs/api.json

@@ -515,7 +515,7 @@
               "type": "string"
             },
             "title": "Knowledgebase IDs",
-            "description": "选定可以检索的知识库范围。"
+            "description": "该字段用于限制当次搜索可访问的知识库范围，默认为空（即不检索任何知识库）。传入具体知识库 ID，则可检索指定的知识库；传入all，则可检索该项目下所有关联知识库。"
           },
           "memory_limit_number": {
             "type": "integer",

content/en/api_docs/api.json

@@ -497,7 +497,7 @@
               "type": "string"
             },
             "title": "Knowledgebase IDs",
-            "description": "Selected scope of knowledgebases for retrieval."
+            "description": "Specifies the scope of knowledge bases accessible for the current search. Defaults to empty, meaning no knowledge bases are searched.Pass specific Knowledgebase IDs to search within that designated repository; pass \"all\" to search across all associated knowledgebases within the project."
           },
           "memory_limit_number": {
             "type": "integer",