[usecase-webapi] Improve MediaQueries w3c usecase

- Update the content description
- Change the page interface and add details for every button

Impacted tests(approved): new 0, update 1, delete 0
Unit test platform: [Tizen IVI][Android]
Unit test result summary: pass 1, fail 0, block 0
Merge pull request #639 from zhuyongyong/yongzhu/usecase-webapi/mediaQueries

[usecase-webapi] Improve MediaQueries w3c usecase