增加文案

VUECODE/smart-property-manage/src/views/bill/add/index.vue

         layout="total, sizes, prev, pager, next, jumper"
         @size-change="handleSizeChange"
         @current-change="handleCurrentChange"/>
+      <span style="color: #99a9bf;font-size: 15px;">点击发送后账单会发送给对应家庭，家庭中的成员都可以查看到他们家的收费项，缴费成功无法线上退款，只能线下当面退款，请先保存为草稿，核对无误后再发送账单给住户</span>
       <el-form-item style="margin-top: 20px;">
         <el-button @click="submitForm('ruleForm', 2)">保存草稿</el-button>
         <el-button type="primary" @click="submitForm('ruleForm', 0)">发送账单</el-button>