[5.4] cs fixes

Author: nicolas-grekas

Cookie.php

@@ -311,8 +311,6 @@ public function isExpired()
 
     /**
      * Gets the samesite attribute of the cookie.
-     *
-     * @return string|null
      */
     public function getSameSite(): ?string
     {

Response.php

@@ -37,8 +37,6 @@ public function __construct(string $content = '', int $status = 200, array $head
 
     /**
      * Converts the response object to string containing all headers and the response content.
-     *
-     * @return string
      */
     public function __toString(): string
     {
@@ -58,8 +56,6 @@ public function __toString(): string
 
     /**
      * Gets the response content.
-     *
-     * @return string
      */
     public function getContent(): string
     {