Apply suggestions from code review

Author: OskarStark

src/platform/src/Bridge/VertexAi/Tests/Contract/AssistantMessageNormalizerTest.php

@@ -48,6 +48,12 @@ public function testNormalize(AssistantMessage $message, array $expectedOutput)
         $this->assertSame($expectedOutput, $normalized);
     }
 
+    /**
+     * @return iterable<string, array{
+     *     AssistantMessage,
+     *     array{text?: string, functionCall?: array{name: string, args?: mixed}}[]
+     * }>
+     */
     public static function normalizeDataProvider(): iterable
     {
         yield 'assistant message' => [

src/platform/src/Bridge/VertexAi/Tests/Contract/UserMessageNormalizerTest.php

@@ -69,6 +69,9 @@ public function testNormalizeBinaryContent(File $content, string $expectedMimeTy
         $this->assertStringStartsWith($expectedPrefix, $normalized[1]['inlineData']['data']);
     }
 
+    /**
+     * @return iterable<string, array{0: File, 1: string, 2: string}>
+     */
     public static function binaryContentProvider(): iterable
     {
         yield 'image' => [Image::fromFile(\dirname(__DIR__, 5).'/tests/Fixtures/image.jpg'), 'image/jpeg', '/9j/'];