Cleaned up typos in chapter comparing Sf2 and sf1

Fixed name of Symfony Standard Edition and bundle/bundles typos.

Note: however in 2.1.x onwards vendor/bundles is not used any more (and default app/autoload.php doesn't look like this), so might be better to rewrite the autoloader section completely with an Acme example - or explain the new vendor autoloader.

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.0
| Fixed tickets | N/A