[DOC beta] Fix code highlight and add missing YUIDoc markup

I fixed some docs such as the followings.
And all changes are checked in my local.

Before:
![2013-12-21 1 02 30](https://f.cloud.github.com/assets/290782/1791767/3df6a1ca-6993-11e3-95ba-a946019e4f1e.png)

After:
![2013-12-21 1 03 02](https://f.cloud.github.com/assets/290782/1791768/40c9b590-6993-11e3-8339-2d5dc09a99f5.png)