[FrameworkBundle] Update deprecation message

Small addition to (doc string only):
https://github.com/symfony/symfony/pull/9252
minor #9389 [FrameworkBundle] Update deprecation message (asm89)

This PR was merged into the master branch.

Discussion
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[FrameworkBundle] Update deprecation message

Small addition to (doc string only):
https://github.com/symfony/symfony/pull/9252

Commits
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b057fab [FrameworkBundle] Update deprecation message