Remove temp comment

Signed-off-by: Seonghyeon Cho <seonghyeoncho96@gmail.com>

Author: sh-cho

core/src/test/java/com/linecorp/armeria/internal/server/annotation/AnnotatedServiceNullableParamTest.java

@@ -89,8 +89,6 @@ public String otherNullable(
                     return nullable(value);
                 }
 
-                // TODO(vince): add test for TYPE_USE @Nullable
-
                 @Get("/default")
                 public String defaultValue(@Header @Default("unspecified") String value) {
                     return value;

kotlin/src/test/kotlin/com/linecorp/armeria/server/kotlin/NullableTypeSupportTest.kt

@@ -35,7 +35,6 @@ import org.junit.jupiter.params.ParameterizedTest
 import org.junit.jupiter.params.provider.ValueSource
 import java.lang.reflect.ParameterizedType
 
-// TODO(vince): add test for TYPE_USE @Nullable
 @GenerateNativeImageTrace
 class NullableTypeSupportTest {
     @ParameterizedTest