Output multiple examples in V2

Author: darrelmiller

src/Microsoft.OpenApi/Models/OpenApiResponse.cs

@@ -136,12 +136,20 @@ public void SerializeAsV2WithoutReference(IOpenApiWriter writer)
                         (w, s) => s.SerializeAsV2(w));
 
                     // examples
-                    if (mediatype.Value.Example != null)
+                    if (Content.Values.Any(m => m.Example != null))
                     {
                         writer.WritePropertyName(OpenApiConstants.Examples);
                         writer.WriteStartObject();
-                        writer.WritePropertyName(mediatype.Key);
-                        writer.WriteAny(mediatype.Value.Example);
+
+                        foreach (var mediaTypePair in Content)
+                        {
+                            if (mediaTypePair.Value.Example != null)
+                            {
+                                writer.WritePropertyName(mediaTypePair.Key);
+                                writer.WriteAny(mediaTypePair.Value.Example);
+                            }
+                        }
+
                         writer.WriteEndObject();
                     }
                 }