…(chalasr)

This PR was merged into the 3.3-dev branch.

Discussion
----------

[FrameworkBundle] Document removal of server:* commands

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #21373
| License       | MIT
| Doc PR        | n/a

To ease upgrading.

We could also add something like that in the framework application:
```php
public function findNamespace($namespace)
{
    try {
        return parent::findNamespace($namespace);
    } catch (CommandNotFoundException $e) {
        if ('server' === $namespace) {
            throw new CommandNotFoundException('The "server:start", "server:stop", "server:status" and "server:run" commands have been moved...');
        }
    }
}
```
But AFAIK we never did so in the past, tell me if we should.

Commits
-------

c99641a Document removal of server:* commands from the framework