[GitHub] wicket issue #340: Improve formatting of example snippet

[jmewes]

Github user jmewes commented on the issue:

    https://github.com/apache/wicket/pull/340
  
    Currently this snippet is hardly readable in the documentation:
    
    
![before](https://user-images.githubusercontent.com/5235584/48911937-90566c00-ee74-11e8-8cd0-a664ae9323e2.png)
    
    With this commit is should become better:
    
    
![after_png](https://user-images.githubusercontent.com/5235584/48911958-9e0bf180-ee74-11e8-8245-2aaf85dd6d37.png)
    



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