minor #18114 update default value for framework.ide (GromNaN)

This PR was merged into the 6.2 branch.

Discussion
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update default value for framework.ide

The default value was changed in symfony/symfony#44575

Commits
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9636026 update default value for framework.ide

Author: javiereguiluz

reference/configuration/framework.rst

@@ -266,7 +266,7 @@ reverse proxy. See :doc:`/deployment/proxies`.
 ide
 ~~~
 
-**type**: ``string`` **default**: ``null``
+**type**: ``string`` **default**: ``%env(default::SYMFONY_IDE)%``
 
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