update doc api

@@ -10,7 +10,7 @@
 - Method: POST
 - RequestBody:
 
-```json
+```json5
 {
   // 登录凭证
   "jsCode": "wx_jsCode",
@@ -22,7 +22,7 @@
 
 - ResponseBody:
 
-```json
+```java
     // status
     private ResponseStatus status;
     private String message;
@@ -37,7 +37,7 @@
 - Method: POST
 - RequestBody:
 
-```json
+```json5
 {
     "openId": "user_openId",
     "invitationCode": "invitation_code"
@@ -104,7 +104,7 @@ public static class Response {
   // 邀请人的邀请码
   "invitationCode": 100000001,
   
-  // 领取课程类型：体验课 = 'COURSE_EXPERIENCE'， 单词课 = "COURSE_TEXTBOOK_V2_WORD"
+  // 领取课程类型：体验课 = 'COURSE_EXPERIENCE'， 正式课 = "COURSE_PRODUCT"
   "courseType": "COURSE_EXPERIENCE",
   // 领取的教材版本
   "versionCode": "versionCode",