minor #8405 Improve description about "framework.ide" config option (aik099)

This PR was submitted for the 3.2 branch but it was merged into the 3.3 branch instead (closes #8405).

Discussion
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Improve description about "framework.ide" config option

According to code in https://github.com/symfony/symfony/blob/master/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php#L179 when both `xdebug.file_link_format` (in `php.ini`) and `framework.ide` (in `app/config/config.yml`) are defined, then `xdebug.file_link_format` wins, but documentetion says the opposite.

P.S.

* PR is targeting the oldest supported documentation branch, where fixed text fragment is present.
* It should be merged to `3.3` and `3.4` branches as well.
* The documentation is changed and not mentioned code, because changing code would introduce a BC break.

Commits
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432d456 Improve description about "framework.ide" config option

Author: xabbuh

reference/configuration/framework.rst

@@ -251,7 +251,7 @@ need to escape the percent signs (``%``) by doubling them.
 .. note::
 
     If both ``framework.ide`` and ``xdebug.file_link_format`` are defined,
-    Symfony uses the value of the ``framework.ide`` option.
+    Symfony uses the value of the ``xdebug.file_link_format`` option.
 
 .. tip::