minor #17449 [Security] Propose attributes usage (ffouillet)

This PR was merged into the 6.0 branch.

Discussion
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[Security] Propose attributes usage

Propose attributes usage instead of annotations which stick more to the example

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Commits
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1fb6ad0 Update security.rst

Author: OskarStark

security.rst

@@ -2148,7 +2148,7 @@ will happen:
 .. _security-securing-controller-annotations:
 
 Thanks to the SensioFrameworkExtraBundle, you can also secure your controller
-using annotations:
+using attributes:
 
 .. configuration-block::