Added final override section
Fixed wrong redirecting
Fixed embedded references
Some minor fixes
Change order of annotations to be the same as the gengerator

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | doctrine
| Fixed tickets |
added docs about child forms customization
Updated the documentation for the simplified Callback constraint
added documentation about Request::setFactory()
fix versionadded directive
fix build errors
remove blank line so that the versionadded directive is rendered properly
Merge pull request #2990 from WouterJ/override_validation

Added last missing override section
[#2990] Minor tweaks to new validation overriding instructions
Merge branch '2.2' into 2.3
[#2728] Fixing typo thanks to @xabbuh
Merge pull request #3036 from xabbuh/fix-build-errors-master

fix versionadded directive
Merge pull request #3037 from xabbuh/fix-versionadded

remove blank line so that the versionadded directive is render properly
Merge pull request #2993 from WouterJ/issue_2846

Fixed wrong redirection of virtuals -> inherit_data
Merge pull request #3035 from xabbuh/fix-build-errors-2.3

fix build errors
Merge branch 'fix_roles' of github.com:WouterJ/symfony-docs into WouterJ-fix_roles

Conflicts:
	book/http_fundamentals.rst
	cookbook/bundles/extension.rst