Clarify parameters conventions
Added tip for Entity Listeners
Fixed typo
fix form type.
Example of getting entity managers directly from the container

The documentation didn't provide examples of how to obtain the entity managers directly from the DI container.  This is useful when needing to inject the em into other services.

The ems are added to the container using the service id `doctrine.orm.%s_entity_manager`, where `%s` is the em's name.  This is done by `\Doctrine\Bundle\DoctrineBundle\DependencyInjection\DoctrineExtension::loadOrmEntityManager()` (see: https://github.com/doctrine/DoctrineBundle/blob/v1.2.0/DependencyInjection/DoctrineExtension.php#L347)
Contributions should be based off 2.3 or higher

Per the documentation (http://symfony.com/doc/current/contributing/documentation/overview.html#contributing), the base branch should be 2.3, not 2.2.
Update forms.rst

Hi there, 
I thought it would be nice to specify that you can set a label to false to disable it. I needed it for a project, couldn't find it in the doc, and had to search through a couple of stackoverflow posts to find the solution.
Update forms.rst

not sure what you meant about the wrapping, I applied a soft wrap after "to your input,".
Let me know how that looks
Update forms.rst
Fix typos
Minimize horizontal scrolling in code block to improve readability
Wrap variables in {} for safer interpolation
Fix PSR error
Added CHANGELOG for 2.3
Change interpolation to concatenation
Replace double quotes with single quotes
Fixing typo - thanks to @xabbuh
bug #3493 Type fix in remove.rst (weaverryan)

This PR was merged into the 2.3 branch.

Discussion
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Type fix in remove.rst

Hi guys!

Very minor typo fix... leaving the PR format off.

Thanks!

Commits
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efaad48 Fixing typo - thanks to @xabbuh
bug #3535 fix form type name. (yositani2002)

This PR was merged into the 2.3 branch.

Discussion
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fix form type name.

| Q             | A
| ------------- | ---
| Doc fix?      | [yes]
| New docs?     | [no]
| Applies to    | [all]
| Fixed tickets |

Commits
-------

ef4014d fix form type.
Add missing variable assignment

Line 41 made use of $crawler which wasn't defined.