修正comment，banner接口

src/main/java/com/lovenav/service/BannersService.java

@@ -0,0 +1,14 @@
+package com.lovenav.service;
+
+import com.lovenav.entity.Banners;
+
+public interface BannersService {
+//    跳转链接
+    String Jump_url(int id);
+//    添加banner
+    String Add_banner(Banners banners);
+//    删除banner
+    String Delete_banner(int id);
+//    展示banner
+    String View_banner();
+}