Fix/datasets api description error (#8025)

web/app/(commonLayout)/datasets/template/template.en.mdx

@@ -985,7 +985,7 @@ import { Row, Col, Properties, Property, Heading, SubProperty, Paragraph } from
 
     ### Request Body
     <Properties>
-      <Property name='segment' type='object list' key='segment'>
+      <Property name='segment' type='object' key='segment'>
         - <code>content</code> (text) text content/question content，required
         - <code>answer</code> (text) Answer content, not required, passed if the Knowledge is in qa mode
         - <code>keywords</code> (list) keyword, not required

web/app/(commonLayout)/datasets/template/template.zh.mdx

@@ -985,7 +985,7 @@ import { Row, Col, Properties, Property, Heading, SubProperty, Paragraph } from
 
     ### Request Body
     <Properties>
-      <Property name='segment' type='object list' key='segment'>
+      <Property name='segment' type='object' key='segment'>
         - <code>content</code> (text) 文本内容/问题内容，必填
         - <code>answer</code> (text) 答案内容，非必填，如果知识库的模式为qa模式则传值
         - <code>keywords</code> (list) 关键字，非必填