fix example, followup to OAI#932

Author: webron

versions/3.0.md

@@ -1297,8 +1297,8 @@ requestBody:
           # require XML content-type in utf-8 encoding
           contentType: application/xml; charset=utf-8
         profileImage:
-        # only accept png/jpeg
-        contentType: image/png, image/jpeg
+          # only accept png/jpeg
+          contentType: image/png, image/jpeg
 ```
 
 #### <a name="responsesObject"></a>Responses Object