minor #52321 DX: re-apply self_accessor and phpdoc_types_order by PHP CS Fixer (keradus)

This PR was squashed before being merged into the 6.4 branch.

Discussion
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DX: re-apply self_accessor and phpdoc_types_order by PHP CS Fixer

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        | Fix CS
| License       | MIT

one further step to clean the CS status-quo, aiming for all-green in long-term

Commits
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ccd78410e9 DX: re-apply self_accessor and phpdoc_types_order by PHP CS Fixer

Author: nicolas-grekas

Response.php

@@ -331,7 +331,7 @@ public function prepare(Request $request): static
     /**
      * Sends HTTP headers.
      *
-     * @param null|positive-int $statusCode The status code to use, override the statusCode property if set and not null
+     * @param positive-int|null $statusCode The status code to use, override the statusCode property if set and not null
      *
      * @return $this
      */

StreamedResponse.php

@@ -68,7 +68,7 @@ public function getCallback(): ?\Closure
     /**
      * This method only sends the headers once.
      *
-     * @param null|positive-int $statusCode The status code to use, override the statusCode property if set and not null
+     * @param positive-int|null $statusCode The status code to use, override the statusCode property if set and not null
      *
      * @return $this
      */