[Doc] add some english documents (#220)

* [bugfix] Checkbox border render error in weixin browser

* [bugfix] TreeSelect dependency path error

* [bugfix] Swipe should clear autoplay timer when destroyed

docs/examples-docs/zh-CN/image-preview.md

@@ -4,6 +4,11 @@
     margin-left: 15px;
   }
 }
+.van-image-preview {
+  img {
+    pointer-events: none;
+  }
+}
 </style>
 
 <script>

docs/examples-docs/zh-CN/lazyload.md

@@ -15,6 +15,11 @@
     background-repeat: no-repeat;
     box-sizing: border-box;
   }
+
+  .zan-doc-demo-block__title,
+  .zan-doc-demo-block__subtitle {
+    padding-left: 0;
+  }
 }
 </style>