minor #18213 Patch 18 (hbgamra)

This PR was submitted for the 6.3 branch but it was merged into the 5.4 branch instead.

Discussion
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Patch 18

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Commits
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28333d8 add Void to delete method

Author: OskarStark

security/passwords.rst

@@ -242,7 +242,7 @@ After configuring the correct algorithm, you can use the
                 // ...
             }
 
-            public function delete(UserPasswordHasherInterface $passwordHasher, UserInterface $user)
+            public function delete(UserPasswordHasherInterface $passwordHasher, UserInterface $user): void
             {
                 // ... e.g. get the password from a "confirm deletion" dialog
                 $plaintextPassword = ...;