完善 BPM 代码，补充工作流的视频教程

Author: YunaiV

src/views/bpm/processInstance/detail.vue

@@ -45,6 +45,8 @@
         </router-link>
       </div>
     </el-card>
+
+    <!-- 审批记录 -->
     <el-card class="box-card" v-loading="tasksLoad">
       <div slot="header" class="clearfix">
         <span class="el-icon-picture-outline">审批记录</span>