Private function requestBody() does not need to be marked as internal (#454)

* Private function requestBody() does not need to be marked as internal

* Update generated code

Author: Nyholm

src/Sts/Input/AssumeRoleRequest.php

@@ -304,9 +304,6 @@ public function setTransitiveTagKeys(array $value): self
         return $this;
     }
 
-    /**
-     * @internal
-     */
     private function requestBody(): array
     {
         $payload = [];

src/Sts/Input/AssumeRoleWithWebIdentityRequest.php

@@ -215,9 +215,6 @@ public function setWebIdentityToken(?string $value): self
         return $this;
     }
 
-    /**
-     * @internal
-     */
     private function requestBody(): array
     {
         $payload = [];

src/Sts/Input/GetCallerIdentityRequest.php

@@ -34,9 +34,6 @@ public function request(): Request
         return new Request('POST', $uriString, $query, $headers, StreamFactory::create($body));
     }
 
-    /**
-     * @internal
-     */
     private function requestBody(): array
     {
         $payload = [];