Update getting-started.rst

The tutorial assumes Doctrine 2.4
Merge pull request #700 from rbroen/patch-2

Update getting-started.rst
list_bugs.php needs to call to getters for protected vars

list_bugs.php needs to call to getters for protected vars. This was changed in the "getting-started" code repository, but not in the "getting-started" tutorial.
Merge pull request #701 from rbroen/patch-2

list_bugs.php needs to call to getters for protected vars