minor #21524 clean up versionadded directives (xabbuh)

This PR was merged into the 8.0 branch.

Discussion
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 clean up versionadded directives

Commits
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1cb25c7 clean up versionadded directives

Author: javiereguiluz

routing.rst

@@ -2332,11 +2332,6 @@ Now you'll get the expected results when generating URLs in your commands::
     ``_locale`` parameter. You can override this by providing a different value
     for the ``_locale`` parameter when generating each route.
 
-    .. versionadded:: 7.4
-
-        The default locale is used as the value of the ``_locale`` parameter
-        starting from Symfony 7.4.
-
 Checking if a Route Exists
 ~~~~~~~~~~~~~~~~~~~~~~~~~~