修改bug 56458 角色管理，添加灰色占位提示

src/views/system/role/index.vue

@@ -143,7 +143,7 @@
           <el-input v-model.trim="form.roleKey" show-word-limit :maxlength="30" placeholder="请输入权限字符" />
         </el-form-item>
         <el-form-item label="角色排序" prop="roleSort">
-          <el-input-number v-model="form.roleSort" style="width: 100%" controls-position="right" :min="0" :max="9999"/>
+          <el-input-number v-model="form.roleSort" style="width: 100%" controls-position="right" :min="0" :max="9999" placeholder="请输入角色排序"/>
         </el-form-item>
         <el-form-item label="角色状态">
           <el-radio-group v-model="form.flag">