fix wrong python block in ipynb (#812)

05.recommender_system/README.md

@@ -206,9 +206,8 @@ mov_id = train_sample[len(user_info[uid].value())]
 print("User %s rates Movie %s with Score %s"%(user_info[uid], movie_info[mov_id], train_sample[-1]))
 ```
 
-```python
-User <UserInfo id(1), gender(F), age(1), job(10)> rates Movie <MovieInfo id(1193), title(One Flew Over the Cuckoo's Nest ), categories(['Drama'])> with Score [5.0]
-```
+    User <UserInfo id(1), gender(F), age(1), job(10)> rates Movie <MovieInfo id(1193), title(One Flew Over the Cuckoo's Nest ), categories(['Drama'])> with Score [5.0]
+
 
 That is, the user 1 evaluates the movie 1193 as 5 points.
 

05.recommender_system/index.html

@@ -248,9 +248,8 @@ mov_id = train_sample[len(user_info[uid].value())]
 print("User %s rates Movie %s with Score %s"%(user_info[uid], movie_info[mov_id], train_sample[-1]))
 ```
 
-```python
-User <UserInfo id(1), gender(F), age(1), job(10)> rates Movie <MovieInfo id(1193), title(One Flew Over the Cuckoo's Nest ), categories(['Drama'])> with Score [5.0]
-```
+    User <UserInfo id(1), gender(F), age(1), job(10)> rates Movie <MovieInfo id(1193), title(One Flew Over the Cuckoo's Nest ), categories(['Drama'])> with Score [5.0]
+
 
 That is, the user 1 evaluates the movie 1193 as 5 points.