docs(components): [TreeSelect] default value is reversed (element-plus#8738)

Author: yujinpan

docs/en-US/component/tree-select.md

@@ -20,9 +20,9 @@ tree-select/basic
 
 :::tip
 
-Since `render-after-expand` defaults to false,
+Since `render-after-expand` defaults to `true`,
 the selected label name may not be displayed when echoing,
-you can set it to true to display the correct name.
+you can set it to `false` to display the correct name.
 
 :::