Update getting-started.rst

The inline cli-config.php, bootstrap.php examples were out of sync with Doctrine 2.4.x — I referenced https://github.com/doctrine/doctrine2-orm-tutorial/ for correct examples
fixed spelling mistake "bootsrapped"
Updated require version and my earlier errors dissolved

As stated, the tutorial was written for 2.4.x, but the composer.json settings proffered would install 2.3.4, which has a different enough API that basic parts of the tutorial code would fail.
Merge pull request #759 from mfdj/patch-1

Fixed out of sync code examples in getting-started.rst