[FrameworkBundle] Add atom editor to IDE config

[javiereguiluz]

This issue is reserved for first-time contributors. If you send a pull request and you aren't a first-time contributor to Symfony Docs, we'll need to close your pull request. Thanks for understanding it!

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See symfony/symfony#25415

To fix this issue, you need to update this file: reference/configuration/framework.rst in the master branch. To do so, you can simply browse https://symfony.com/doc/master/reference/configuration/framework.html and click on Edit this page.

Then, add atom to the list of editors displayed in the ide option: https://symfony.com/doc/master/reference/configuration/framework.html#ide

[alcaeus]

Linking #9043 and #9044 for the sake of completeness.

[javiereguiluz]

Closing as fixed by #9043.