minor #20328 [HttpKernel] Fix class name (seb-jean)

This PR was merged into the 7.1 branch.

Discussion
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[HttpKernel] Fix class name

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Commits
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902d750 Update controller.rst

Author: javiereguiluz

controller.rst

@@ -578,7 +578,7 @@ To do so, map the parameter as an array and configure the type of each element
 using the ``type`` option of the attribute::
 
     public function dashboard(
-        #[MapRequestPayload(type: UserDTO::class)] array $users
+        #[MapRequestPayload(type: UserDto::class)] array $users
     ): Response
     {
         // ...