Fix horizontal overflow that occurs in the code tag

closes #14167 

### Before Fix
![Screen_Shot_2016-03-16_at_9.10.52_PM](/uploads/b4a282ffc33684983d7e2482b8e13a8f/Screen_Shot_2016-03-16_at_9.10.52_PM.png)

### After Fix
![Screen_Shot_2016-03-16_at_9.11.16_PM](/uploads/8acca3b46bfdbd929cc096ad070022e2/Screen_Shot_2016-03-16_at_9.11.16_PM.png)


See merge request !3255