Fixed typo
Update dynamic_form_modification.rst
Update dynamic_form_modification.rst
Merge pull request #490 from AClavijo/patch-1

Update dynamic_form_modification.rst
Merge pull request #491 from AClavijo/patch-2

fix fault
Merge pull request #489 from saro0h/fix-typo-security-component

Fixed typo
Merge pull request #492 from symfony-fr/2.4

Merging 2.4
Merge branch '2.4' into 2.3