add cookbook article for the server:run command
feature #4000 [Cookbook] add cookbook article for the server:run command (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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[Cookbook] add cookbook article for the server:run command

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | yes (symfony/symfony#3465)
| Applies to    | all
| Fixed tickets |

Commits
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57f467a add cookbook article for the server:run command