修改文案

src/pages/system/housingPolicy.jsx

@@ -48,7 +48,7 @@ const toEditPolicy = (policyId) => () => {
   
   const columns = [
     {
-      title: '购房政策主图',
+      title: '购房须知主图',
       dataIndex: 'policyImg',
       key: 'policyImg',
       align: 'center',