minor #18591 [Best Practices] Remove annotations paragraph (alexandre-daubois)

This PR was merged into the 6.2 branch.

Discussion
----------

[Best Practices] Remove annotations paragraph

<!--

If your pull request fixes a BUG, use the oldest maintained branch that contains
the bug (see https://symfony.com/releases for the list of maintained branches).

If your pull request documents a NEW FEATURE, use the same Symfony branch where
the feature was introduced (and `6.x` for features of unreleased versions).

-->

Commits
-------

e415d19 [Best Practices] Remove annotations paragraph

Author: javiereguiluz

best_practices.rst

@@ -207,9 +207,6 @@ Doctrine supports several metadata formats, but it's recommended to use PHP
 attributes because they are by far the most convenient and agile way of setting
 up and looking for mapping information.
 
-If your PHP version doesn't support attributes yet, use annotations, which is
-similar but requires installing some extra dependencies in your project.
-
 Controllers
 -----------