docs: fix Form requiredMark demo

close #29921

components/form/__tests__/__snapshots__/demo.test.js.snap

@@ -3671,7 +3671,7 @@ exports[`renders ./components/form/demo/required-mark.md correctly 1`] = `
     >
       <label
         class="ant-form-item-required-mark-optional"
-        for="requiredMark"
+        for="requiredMarkValue"
         title="Required Mark"
       >
         Required Mark
@@ -3693,7 +3693,7 @@ exports[`renders ./components/form/demo/required-mark.md correctly 1`] = `
         >
           <div
             class="ant-radio-group ant-radio-group-outline"
-            id="requiredMark"
+            id="requiredMarkValue"
           >
             <label
               class="ant-radio-button-wrapper ant-radio-button-wrapper-checked"

components/form/demo/required-mark.md

@@ -32,11 +32,11 @@ const FormLayoutDemo = () => {
     <Form
       form={form}
       layout="vertical"
-      initialValues={{ requiredMark }}
+      initialValues={{ requiredMarkValue: requiredMark }}
       onValuesChange={onRequiredTypeChange}
       requiredMark={requiredMark}
     >
-      <Form.Item label="Required Mark" name="requiredMark">
+      <Form.Item label="Required Mark" name="requiredMarkValue">
         <Radio.Group>
           <Radio.Button value="optional">Optional</Radio.Button>
           <Radio.Button value>Required</Radio.Button>