Add 'xml' to example code:res/values/integers.xml

Hi.

You might forget to put 'xml' on example code.

Sorry for small pull request.
However I have some idea to improve rdotm so I will write some code.

:sushi: 

![](https://photos-1.dropbox.com/t/0/AACTrMcpT5i0voa4rpYEBTU0Sj0exx6f_6CFv-tWNlfEUw/12/7817937/png/1024x768/3/1408348800/0/2/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88%202014-08-18%2015.12.13.png/fj5mOaj2RRVFPso5rtO_1I05Are832VLB0eNCe9FJNY)