Update service_container.rst

Correction grammaticale
Add missing data_class description
Update dynamic_form_modification.rst

Quelques corrections de typo.
Fix typo: commanden -> commande
Fixed invalid Doctrine XML mapping
Merging #468
Merging #469
Merging #470
Merging #471
Merging #472
Merging #473
Merge pull request #468 from Riges/patch-1

Update service_container.rst
Merge pull request #474 from symfony-fr/2.3

Merging 2.3 to 2.4
Merge pull request #469 from krevindiou/patch-1

Add missing data_class description
Merge pull request #471 from lvParis/patch-1

Update dynamic_form_modification.rst
Merge pull request #472 from mickaelandrieu/patch-1

Fix typo: commanden -> commande
Merge pull request #473 from DerekRoth/patch-1

Fixed invalid Doctrine XML mapping
Merge pull request #475 from symfony-fr/2.4

Merging 2.4