feat（KIP-10466）：纸质优惠券变更文案展示字段

src/pages/parkingFee/parkingFeePaperCoupon.vue

@@ -4,7 +4,7 @@
       <div class="worp">
         <div class="title">纸质优惠劵减免说明</div>
         <div style="font-size: 28px; color: #808080; padding-top: 12px">
-          {{ (orderDetail && orderDetail.parkingRule && orderDetail.parkingRule.paperCouponsDescription) || '' }}
+          {{ (orderDetail && orderDetail.parkingRule && orderDetail.discountInfo.paperCoupons[0].description) || '' }}
         </div>
       </div>
       <div v-if="paperCouponList.length">