Update ca5369.md

Author: Matthew Sebolt

docs/code-quality/ca5369.md

@@ -60,5 +60,5 @@ using System.IO;
 using System.Xml;
 using System.Xml.Serialization;
 ...
-new XmlSerializer(typeof(TestClass).Deserialize(XmlReader.Create (new FileStream("filename", FileMode.Open)));
+new XmlSerializer(typeof(TestClass)).Deserialize(XmlReader.Create (new FileStream("filename", FileMode.Open)));
 ```