Getting Started Guide: Fix code container in Chapter 5.2 [ci-skip]

Generated HTML is not wrapping bash content in a code_container class, due to missing line breaks.

![getting started guide - chapter 5 2 screen shot 2013-09-28 at 1 41 47 am](https://f.cloud.github.com/assets/360276/1227138/6c4764f4-278c-11e3-9f90-fd1c055d38c3.png)