修改api分类

pages/tabBar/API.uvue

@@ -294,13 +294,13 @@
             name: '媒体',
             pages: [
               {
-                name: "图片",
+                name: "拍照和相册选择",
                 url: 'choose-image'
               },
               {
-                name: '图片选择和预览',
+                name: '图片预览',
                 url: 'preview-image',
-                api: ["previewImage", "closePreviewImage", "chooseImage"]
+                api: ["previewImage", "closePreviewImage"]
               },
               {
                 name: "保存图片到相册",