minor #17130 [6.1] don't mention PHP 7 (alexislefebvre)

This PR was merged into the 6.1 branch.

Discussion
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[6.1] don't mention PHP 7

Symfony 6.1 requires PHP 8.1, so mentioning PHP 7 was confusing here, I removed it.

Commits
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108bbe3 6.1 don't mention PHP 7

Author: javiereguiluz

routing.rst

@@ -28,8 +28,8 @@ PHP attributes and annotations allow to define routes next to the code of the
 :doc:`controllers </controller>` associated to those routes. Attributes are
 native in PHP 8 and higher versions, so you can use them right away.
 
-In PHP 7 and earlier versions you can use annotations (via the Doctrine Annotations
-library), but first you'll need to install the following dependency in your project:
+You can use annotations via the Doctrine Annotations library,
+but first you'll need to install the following dependency in your project:
 
 .. code-block:: terminal